Ontario, California, United States of America: What to pack, what to wear, and when to go [2022]
Traveling to Ontario, California, United States of America? If you're planning to go to Ontario, this is some important information about when to go, what to wear, and what to pack.
Contents
- When to go to Ontario
- Important essentials for Ontario
- Activities for Ontario
- Ontario in January: weather and what to pack
- Ontario in February: weather and what to pack
- Ontario in March: weather and what to pack
- Ontario in April: weather and what to pack
- Ontario in May: weather and what to pack
- Ontario in June: weather and what to pack
- Ontario in July: weather and what to pack
- Ontario in August: weather and what to pack
- Ontario in September: weather and what to pack
- Ontario in October: weather and what to pack
- Ontario in November: weather and what to pack
- Ontario in December: weather and what to pack

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.
When to go to Ontario, California, United States of America
Based on the climate and weather in Ontario, the best time to go is May. See below for details.
Important essentials for Ontario, California, United States of America
Here are some general tips on what to wear in Ontario, as well as several items to remember to pack when traveling there.
COVID-19 ESSENTIALS FOR 2022
-
Travel disinfecting wipes
Use these to sanitize plane and hotel surfaces.
-
N95 masks to use in crowded airports
These N95 masks provide the best level of protection available.
Travel insurance
If you or a companion get COVID-19, your amazing trip can be ruined. Good travel insurance can help. See plans
-
Kids' KN95 masks
N95 masks don't exist for kids. These are a good alternative (and can also be used by adults if N95 masks are not available).
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A vaccine card protector
Vaccine cards can wear out. An unreadable card can have severe consequences. This vaccine card protector helps avoid that.
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Hand sanitizer
This hand sanitizer is an excellent TSA-friendly choice.
General health necessities
Don't forget these
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Airplane or car necessities
-
Power bank for devices
A portable power bank, like this one
-
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.
-
For families with young children
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Plug adapter
A plug adapter that supports outlet types A and B. This one should work in most areas, but you should check with your hotel.
What to wear/what to pack for Ontario, California, United States of America by month
Already know when you're traveling?
January
January in Ontario is balmy. Temperatures average in the 60s F (high 10s C) during the day.
What to wear/what to pack:
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
February
February in Ontario is balmy. Temperatures average in the 60s F (high 10s C) during the day.
What to wear/what to pack:
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
March
Traveling to Ontario in March, you will notice that it is mild. Daytime temperatures are in the low 60s F (low 20s C).
What to wear/what to pack:
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
April
Traveling to Ontario in April, you will notice that it is warm. Daytime temperatures are in the 70s F (low 20s C).
What to wear/what to pack:
-
Breathable footwear or sandals
-
Light skirts
-
Extra socks
-
Short pants or heavy shorts
-
Light dresses
You can find some great options here
-
Sunscreen lotion
-
Sandals
-
Bug repellent
-
Long and short sleeve shirts
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
May
May is warm. Temperatures average in the high 70s F (mid 20s C) during the day.
What to wear/what to pack:
-
Sunscreen lotion
-
Light dresses
You can find some great options here
-
Light skirts
-
Long and short sleeve shirts
-
Short pants or heavy shorts
-
Sandals
-
Breathable footwear or sandals
-
Extra socks
-
Bug repellent
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
June
If you are traveling to Ontario in June, you will notice that it is constantly hot. Daytime temperatures are in the 80s F (low 20s C).
What to wear/what to pack:
-
Sunglasses
-
Skirts
-
Insulated water bottle
Our best choice also filters harmful contaminants:
-
Sunscreen lotion, moderate SPF
-
Bug repellent
-
Breatheable shirts
A good breatheable shirt can keep you comfortable and protect you from skin damage:
-
Waterproof sandals
-
Loose-fit shorts
-
Cool and dry dresses
These dresses include UV protection and cool you.
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
July
July in Ontario is unbearably hot. Temperatures average in the low 90s F (low 30s C) during the day.
What to wear/what to pack:
-
Cooling tank or crop tops
These are specially designed to cool you:
Bug bite relief
-
Light dresses
These Columbia dresses are engineered to keep you cool and include UV protection.
-
Bug repellent
-
Waterproof sandals
-
Personal cooling fan
-
Light linen shorts
-
Insulated water bottle
-
UV protecting legwear
These will keep you protected from UV rays while also cool. Our favorites:
-
High-SPF sunscreen lotion
-
Sunglasses
-
Thin short sleeve shirts
Don't forget bring additional, since these often get wet or dirty.
-
Skirts
-
Lightweight 'harem' pants
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
August
If you visit Ontario during August, you might find that it is a scorcher. Temperatures tend to hover around the 90s F (mid 30s C) during the day, while at night they can dip into the 60s F (high 10s C). Humidity is generally between 30 and 40% during the day.
What to wear/what to pack:
-
Light linen shorts
-
Light dresses
These Columbia dresses are specially designed to keep you cool and to provide UV protection.
-
Waterproof sandals
-
Personal cooling fan
-
Cooling tank or crop tops
These are specially designed for cooling:
-
Thin short sleeve shirts
Remember to bring additional, since these often get wet or dirty.
-
Sunglasses
-
High-SPF sunscreen lotion
-
UV protecting legwear
These will keep you protected from UV rays while also cool. Our favorites:
-
Skirts
-
Bug repellent
-
Insulated water bottle
-
Lightweight 'harem' pants
Bug bite relief
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
September
If you are traveling to Ontario in September, you will notice that it is consistently hot. Daytime temperatures are in the high 80s F (low 30s C).
What to wear/what to pack:
-
Waterproof sandals
-
Cool and dry dresses
These dresses to provide UV protection and help you stay cool.
-
Sunglasses
-
Insulated water bottle
Our fave also filters harmful contaminants:
-
Breatheable shirts
A cooling shirt can make you comfortable and guard against skin damage:
-
Loose-fit shorts
-
Skirts
-
Bug repellent
-
Sunscreen lotion, moderate SPF
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
October
Traveling to Ontario in October, you will notice that it is pretty consistently hot. Daytime temperatures are in the low 80s F (high 20s C).
What to wear/what to pack:
-
Light skirts
-
Short pants or heavy shorts
-
Sandals
-
Long and short sleeve shirts
-
Light dresses
You can find some great options here
-
Extra socks
-
Bug repellent
-
Breathable footwear or sandals
-
Sunscreen lotion
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
November
November in Ontario is mild. The average overnight temperatures in the area are in the high 40s F (single digits C). With the colder weather comes lower humidity, which is in the 30% to 40% range on average.
What to wear/what to pack:
-
Extra socks
-
Bug repellent
-
Short pants or heavy shorts
-
Sandals
-
Light dresses
You can find some great options here
-
Long and short sleeve shirts
-
Light skirts
-
Sunscreen lotion
-
Breathable footwear or sandals
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
December
If you visit Ontario during December, you will probably find 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 low 40s F (single digits C). Humidity is generally between 40 and 50% during the day.
What to wear/what to pack:
If you visit the Museum of History and Art, wear museum-appropriate clothing and take:
-
Ultralight day pack
Like this, so you don't have to lug around a heavy suitcase.
-
Small portable cooler
Save money on drinks with this portable cooler.
-
Comfy walking shoes
Activities for Ontario, California, United States of America
Here are some activity recommendations and activity-specific packing tips for Ontario.
Check out our guides for these other locations: Essex, England, United Kingdom, Danube Delta, Romania, Quarto d'Altino, Italy, Bihar, India, Rum, Scotland, United Kingdom, Joshin'etsukogen National Park, Japan, Tulancingo, Puebla, Mexico, Trujillo, Peru, Fort Meade, Florida, United States of America, Annapolis Royal, Nova Scotia, Canada, and Lavaux, Switzerland.