Ontario, California, United States of America: What to pack, what to wear, and when to go [2024]

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Ready to pack for Ontario, California, United States of America? If you're planning to go to Ontario, I've got some important information about when to go, what to wear, and what to pack.

Contents

When to go to Ontario, California, United States of America

Based on the climate and weather in Ontario, California, United States of America, the best time to go is May. See below for details.

What to wear/what to pack for Ontario, California, United States of America

Already know when you're traveling?

Here are some general tips on what to wear in Ontario, as well as several items to remember to pack when traveling there.

What to wear/what to pack for Ontario, California, United States of America by month

January

January in Ontario is balmy. The rain can amount to several inches/centimeters. During this time, temperatures average in the 60s F (high 10s C), although night temperatures can dip into the low 40s F (single digits C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Anti-theft backpack

    For a bit of protection, an anti-theft backpack protects your stuff.

  • AirTag to track your luggage

    With airlines repeatedly losing bags recently, an AirTag can locate it anywhere anywhere: AirTag for iPhones.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials

  • Travel pillow

    Our fave is this one

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Ensure that you choose the necessary kind. Most adapters currently available are just plugs and expect your electronics to change the voltage themselves. If yours can't do that they could get destroyed. This one should work in most countries.

  • Luggage scale to avoid fees

    Airlines charge huge amounts for overweight luggage. Avoid surcharges with this

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

February

If you vacation in Ontario during February, you might notice that it is balmy. Temperatures tend to hover around the 60s F (high 10s C) during the day, while at night they can dip into the 40s F (single digits C). Humidity is generally between 40 and 50% during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Anti-theft backpack

    For a bit of protection, an anti-theft backpack protects your things.

  • AirTag to track your luggage

    With airlines frequently losing bags recently, an AirTag can find it anywhere on earth: AirTag for iPhones.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Luggage scale to avoid fees

    Airlines charge excessive penalties for overweight luggage. Avoid surcharges with this

  • Power bank for devices

    A portable power bank, like this one

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Be careful to choose the right kind. The vast majority of adapters currently being sold are simply plugs and expect your devices to adjust the voltage themselves. If yours can't do that they could get fried. This one works in most countries.

  • Travel pillow

    Our favorite is this one

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

March

March here is mild. Temperatures average in the low 60s F (low 20s C) during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • AirTag to track your luggage

    With airlines frequently losing luggage these days, an AirTag can help you find it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a little peace of mind, an anti-theft backpack protects your belongings.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel neck pillow

    A great choice is this one

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Make sure to get the necessary type. Most adapters available are simply plugs and require your devices to change the voltage themselves. If your devices can't do that they could get fried. This one should work in most locations.

  • Luggage scale to avoid fees

    Airlines charge excessive penalties for overweight luggage. Avoid surcharges with this

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

April

If you are traveling to Ontario in April, you will notice that it is a perfect temperature. Daytime temperatures are in the 70s F (low 20s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • AirTag to track your luggage

    With airports constantly losing bags recently, an AirTag can locate it anywhere on earth: AirTag for iPhones.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Anti-theft backpack

    For a little protection, an anti-theft backpack protects your stuff.

Comfort + Essentials

  • Travel neck pillow

    A good option is this one

  • Voltage step down adapter

    A plug adapter that supports outlet types A and B. Take care to pick the necessary type. Most adapters available online are just plugs and expect your electronics to change the voltage themselves. If yours can't do that they could get destroyed. This one should be appropriate for most countries.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Power bank for devices

    A portable power bank, like this one

  • Luggage scale to avoid fees

    Airlines charge large prices for overweight luggage. Save money with this

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

May

May is a perfect temperature. Temperatures average in the high 70s F (mid 20s C) during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • AirTag to track your luggage

    With airports constantly losing things recently, an AirTag can help you find it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a little peace of mind, an anti-theft backpack protects your belongings.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

Comfort + Essentials

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Luggage scale to avoid fees

    Airlines charge large penalties for overweight luggage. Save money with this

  • Voltage adapter

    A plug adapter that supports outlet types A and B. Check that you get the necessary kind. Many adapters that you can buy are simply plugs and expect your electronics to convert the voltage themselves. If your devices can't do that they could get destroyed. This one should work in most countries.

  • Power bank for devices

    A portable power bank, like this one

  • Travel neck support pillow

    A great choice is this one

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

June

If you go to Ontario in June, you will notice that it is really hot. Daytime temperatures are in the 80s F (low 20s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • AirTag to track your luggage

    With airlines constantly losing things these days, an AirTag can help you find it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a little protection, an anti-theft backpack protects your stuff.

Comfort + Essentials

  • Power bank for devices

    A portable power bank, like this one

  • Travel neck support pillow

    A versatile choice is this one

  • Luggage scale to avoid fees

    Airlines charge huge prices for overweight luggage. Avoid penalties with this

  • Voltage adapter

    A plug adapter that supports outlet types A and B. Be sure to get the necessary kind. A lot of adapters for sale now are simply plug changers and expect your electronics to change the voltage themselves. If your devices can't do that they could burn up. This one should be sufficient for most areas.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

July

If you are traveling to Ontario in July, you will notice that it can be sizzling. Daytime temperatures are in the low 90s F (low 30s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • AirTag to track your luggage

    With airports always losing things these days, an AirTag can help you find it anywhere in the world: AirTag for iPhones.

  • Anti-theft backpack

    For a little peace of mind, an anti-theft backpack protects your belongings.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials

  • Luggage scale to avoid fees

    Airlines charge huge prices for overweight luggage. Avoid penalties with this

  • Voltage step down adapter

    A plug adapter that supports outlet types A and B. Make sure to get the right type. Many adapters currently sold are just plug changers and require your electronics to convert the voltage themselves. If your electronics can't do that they could get fried. This one should work in most places.

  • Travel pillow

    Our favorite is this one

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

August

If you are traveling to Ontario in August, you will notice that it is blindingly hot. Daytime temperatures are in the 90s F (mid 30s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • AirTag to track your luggage

    With airlines always losing bags recently, an AirTag can locate it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a little peace of mind, an anti-theft backpack protects your stuff.

Comfort + Essentials

  • Luggage scale to avoid fees

    Airlines charge huge penalties for overweight luggage. Avoid penalties with this

  • Power bank for devices

    A portable power bank, like this one

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Check that you pick the necessary type. Many adapters available online are just plug changers and require your electronics to adjust the voltage themselves. If yours can't do that they could get destroyed. This one should be sufficient for most places.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel neck support pillow

    Our favorite is this one

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

September

If you are traveling to Ontario in September, you will notice that it is extremely hot. Daytime temperatures are in the high 80s F (low 30s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • AirTag to track your luggage

    With airlines repeatedly losing things these days, an AirTag can locate it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a bit of protection, an anti-theft backpack protects your belongings.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

Comfort + Essentials

  • Luggage scale to avoid fees

    Airlines charge large amounts for overweight luggage. Save money with this

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Make sure to pick the correct type. The majority of adapters currently being sold are just plugs and expect your devices to adjust the voltage themselves. If yours can't do that they could get fried. This one should be sufficient for most areas.

  • Travel neck pillow

    A versatile choice is this one

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

October

If you vacation in Ontario during October, you may notice that it is pretty consistently hot. Temperatures tend to hover around the low 80s F (high 20s C) during the day, while at night they can dip into the 50s F (low 10s C). Humidity is generally between 40 and 50% during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • AirTag to track your luggage

    With airports frequently losing bags these days, an AirTag can help you find it anywhere anywhere: AirTag for iPhones.

  • Anti-theft backpack

    For a little protection, an anti-theft backpack protects your things.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials

  • Travel neck pillow

    An excellent option is this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Voltage adapter

    A plug adapter that supports outlet types A and B. Take care to pick the correct kind. The vast majority of adapters available are just plugs and require your devices to change the voltage themselves. If yours can't do that they could burn up. This one is sufficent for most locations.

  • Power bank for devices

    A portable power bank, like this one

  • Luggage scale to avoid fees

    Airlines charge excessive amounts for overweight luggage. Avoid surcharges with this

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

November

If you go to Ontario in November, you will notice that it is balmy. Daytime temperatures are in the low 70s F (low 20s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Anti-theft backpack

    For a little peace of mind, an anti-theft backpack protects your belongings.

  • AirTag to track your luggage

    With airlines always losing things these days, an AirTag can help you find it anywhere in the world: AirTag for iPhones.

Comfort + Essentials

  • Travel neck support pillow

    A great choice is this one

  • Luggage scale to avoid fees

    Airlines charge large amounts for overweight luggage. Avoid penalties with this

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Make sure to choose the right kind. The vast majority of adapters for sale now are just plug changers and expect your devices to change the voltage themselves. If your devices can't do that they could get destroyed. This one is sufficent for most locations.

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

December

If you vacation in Ontario during December, you may notice that it is mild. Temperatures tend to hover around the 60s F (high 10s C) during the day, while at night they can dip into the low 40s F (single digits C). Humidity is generally between 40 and 50% during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security

  • AirTag to track your luggage

    With airlines always losing things nowadays, an AirTag can help you locate it anywhere on earth: AirTag for iPhones.

  • Money/passport pouch

    A money pouch is vital for protecting your passport and credit cards.

  • Voice and data SIM card

    A SIM card that works in Ontario. A good global SIM card works in most countries, but check the country list before buying.

  • Anti-theft backpack

    For a bit of peace of mind, an anti-theft backpack protects your belongings.

Comfort + Essentials

  • Luggage scale to avoid fees

    Airlines charge large prices for overweight luggage. Avoid penalties with this

  • Travel pillow

    A great choice is this one

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Voltage step down adapter

    A plug adapter that supports outlet types A and B. Take care to find the correct type. Most adapters currently being sold are just plug changers and require your devices to convert the voltage themselves. If your devices can't do that they could get destroyed. This one should be appropriate for most locations.

If you visit the Museum of History and Art, wear museum-appropriate clothing and take:

What to do in Ontario, California, United States of America

Ontario, California is a bustling city located in Southern California. Although it may be overshadowed by nearby Los Angeles and San Diego, Ontario has plenty to offer in terms of top tourist attractions.

First on the list is the Ontario Mills Mall, one of the largest malls in Southern California. With over 200 stores including designer outlets, a food court, and a movie theater, there's something for everyone here. The mall also includes entertainment options such as Dave & Buster's and an indoor trampoline park.

Next up is the Museum of History and Art, which showcases the rich history of Ontario and the surrounding area. Exhibits include artifacts from Native American tribes, agricultural equipment from the city's farming history, and the Ontario Police Department's vintage patrol car collection.

Another top attraction is the Cucamonga-Guasti Regional Park, which offers over 150 acres of outdoor recreation. Visitors can enjoy hiking trails, fishing in the park's two lakes, or having a picnic with family and friends. The park also includes a water park and a large pool perfect for cooling off in the California heat.

For those interested in aviation, the Planes of Fame Air Museum is a must-visit attraction. The museum features over 150 aircraft, some of which are still operational and participate in air shows. The museum also hosts events such as living history days and is home to a renowned restoration program.

Lastly, the Ontario Convention Center is a top destination for business and leisure travelers. With over 225,000 square feet of meeting and event space, the center hosts conferences, trade shows, and concerts throughout the year.

In conclusion, Ontario, California may not be as well-known as other cities in Southern California, but it is still filled with top tourist attractions. From shopping malls to aviation museums, there's something for every traveler to enjoy in this bustling city.

About your travel guide

Hi! I'm Dev. I've traveled all over the world and in my travels, I have made many packing lists. In this series, my team and I have compiled the most useful information, as well as things we couldn't live without, to help you plan your trip.

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