Contra Costa County, California, United States of America: What to pack, what to wear, and when to go [2023]

Empty Lighthouse is a reader-supported site. This article may contain affiliate links to Amazon and other sites. We earn a commission on purchases made through these links.

Traveling to Contra Costa County, California, United States of America? If you're planning to go to Contra Costa County, the following is some important information about when to go, what to wear, and what to pack.

Contents

When to go to Contra Costa County, California, United States of America

Based on the climate and weather in Contra Costa County, California, United States of America, the best time to go is August. See below for details.

What to wear/what to pack for Contra Costa County, California, United States of America

Already know when you're traveling?

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

What to wear/what to pack for Contra Costa County, California, United States of America by month

January

January in Contra Costa County is relatively cool. The rain can amount to several inches/centimeters. During this time, temperatures average in the 50s F (low 10s 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 Contra Costa County. A good global SIM card works in most countries, but check the country list before buying.

  • Anti-theft backpack

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

Comfort + Essentials
  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel neck pillow

    A top rated pillow is this one

  • Power bank for devices

    A portable power bank, like this one

  • Travel adapter

    A plug adapter that supports outlet types A and B. Be sure to get the right type. The vast majority of adapters for sale now are simply 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 be sufficient for most places.

  • Easy folding travel stroller

    This stroller weighs almost 10 pounds and folds to the size of a big book.

February

February in Contra Costa County is cool. The average overnight temperatures in the area are in the low 40s F (single digits C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security
  • Voice and data SIM card

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

  • Anti-theft backpack

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

  • Money/passport pouch

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

Comfort + Essentials
  • Ultralightweight travel stroller

    This stroller is only 10 lbs and folds to the size of a big book.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Plug adapter

    A plug adapter that supports outlet types A and B. Check that you pick the right type. Many adapters currently being sold are simply plugs and expect your devices to change the voltage themselves. If yours can't do that they could burn up. This one works in most locations.

  • Travel pillow

    A good option is this one

  • Power bank for devices

    A portable power bank, like this one

March

March can be chilly. Temperatures average in the low 60s F (mid 10s C) during the day. It rains regularly.

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 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 Contra Costa County. 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

  • Plug adapter

    A plug adapter that supports outlet types A and B. Ensure that you pick the correct type. The vast majority of adapters available are simply plug changers 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 places.

  • Ultralightweight travel stroller

    This stroller weighs just 10 lbs and folds to the size of a big book.

  • Travel neck support pillow

    Our favorite is this one

April

If you visit Contra Costa County during April, you may notice that it is crisp. Temperatures tend to hover around the low 60s F (high 10s C) during the day, while at night they can dip into the 40s F (single digits C). In terms of precipitation, you can expect it to rain sometimes.

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

  • Voice and data SIM card

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

Comfort + Essentials
  • Ultraportable travel stroller

    This stroller weighs just 10 lbs and folds to the size of a big book.

  • Voltage adapter

    A plug adapter that supports outlet types A and B. Be careful to pick the right type. The majority of adapters on sale are simply plug changers and require your electronics to change the voltage themselves. If yours can't do that they could get fried. This one is sufficent for most locations.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Travel pillow

    A good option is this one

  • Power bank for devices

    A portable power bank, like this one

May

May in Contra Costa County is mild and dry with little rain. The average overnight temperatures in the area are in the high 40s F (single digits C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security
  • Voice and data SIM card

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

  • Anti-theft backpack

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

  • Money/passport pouch

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

Comfort + Essentials
  • Travel neck pillow

    What we like 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

  • Super portable foldable travel stroller

    This stroller weighs almost 10 lbs and folds to the size of a big book.

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Make sure to choose the right type. The majority of adapters currently sold are simply 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 areas.

June

If you vacation in Contra Costa County during June, you may find that it is balmy and very dry with almost no rain. Temperatures tend to hover around the low 60s F (low 20s C) during the day, while at night they can dip into the low 50s F (low 10s 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.

  • 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 Contra Costa County. 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

  • Travel neck support pillow

    A top rated pillow is this one

  • Voltage adapter

    A plug adapter that supports outlet types A and B. Be sure to pick the right type. Many adapters currently sold are just plugs and require your devices to change the voltage themselves. If your electronics can't do that they could get destroyed. This one is sufficent for most locations.

  • Ultralightweight travel stroller

    This stroller weighs just 10 pounds and folds to the size of a big book.

  • Power bank for devices

    A portable power bank, like this one

July

July is mild and very dry with almost no rain. 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.

  • Voice and data SIM card

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

  • Anti-theft backpack

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

Comfort + Essentials
  • Travel pillow

    A good option is this one

  • Super portable foldable travel stroller

    This stroller weighs only 10 pounds and folds to the size of a big book.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Power bank for devices

    A portable power bank, like this one

  • Voltage adapter

    A plug adapter that supports outlet types A and B. It's important that you find the correct kind. A lot of adapters available are just plug changers and require your devices to convert the voltage themselves. If yours can't do that they could get fried. This one should be sufficient for most areas.

August

August in Contra Costa County is balmy and very dry with almost no rain. Temperatures average in the low 70s F (low 20s C) during the day.

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security
  • Anti-theft backpack

    For a bit of 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 Contra Costa County. A good global SIM card works in most countries, but check the country list before buying.

Comfort + Essentials
  • Travel adapter

    A plug adapter that supports outlet types A and B. Be sure to get the correct type. A lot of adapters currently sold are just plug changers and expect your electronics to change the voltage themselves. If yours can't do that they could get fried. This one should be appropriate for most places.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Ultralightweight travel stroller

    This stroller is only 10 lbs and folds to the size of a big book.

  • Travel neck pillow

    What we like is this one

  • Power bank for devices

    A portable power bank, like this one

September

If you visit Contra Costa County during September, you are likely to find that it is balmy and very dry with almost no rain. Temperatures tend to hover around the low 70s F (low 20s C) during the day, while at night they can dip into the 50s F (low 10s C).

What to wear/what to pack:

Clothes + Footwear
Health
Safety + Security
  • Voice and data SIM card

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

  • Anti-theft backpack

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

  • Money/passport pouch

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

Comfort + Essentials
  • Power bank for devices

    A portable power bank, like this one

  • Travel neck support pillow

    A good option is this one

  • Super portable foldable travel stroller

    This stroller weighs almost 10 pounds and folds to the size of a big book.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Plug adapter

    A plug adapter that supports outlet types A and B. Make sure to find the correct type. Most adapters available are just plugs and require your devices to change the voltage themselves. If yours can't do that they could get destroyed. This one is sufficent for most areas.

October

If you vacation in Contra Costa County during October, you will probably notice that it is mild and dry with little rain. Temperatures tend to hover around the low 60s F (low 20s C) during the day, while at night they can dip into the low 50s F (single digits 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.

  • Anti-theft backpack

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

  • Voice and data SIM card

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

Comfort + Essentials
  • Voltage step down adapter

    A plug adapter that supports outlet types A and B. Make sure to find the right type. Many adapters for sale now are just plug changers and expect your devices to adjust the voltage themselves. If your devices can't do that they could burn up. This one should be appropriate for most countries.

  • Power bank for devices

    A portable power bank, like this one

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

  • Folding travel stroller

    This stroller weighs almost 10 pounds and folds to the size of a big book.

  • Travel neck pillow

    A top rated pillow is this one

November

November in Contra Costa County is relatively cool. The rain can amount to several inches/centimeters. During this time, temperatures average in the 50s F (low 10s C) to low 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
  • Voice and data SIM card

    A SIM card that works in Contra Costa County. 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 bit of protection, an anti-theft backpack protects your things.

Comfort + Essentials
  • Power bank for devices

    A portable power bank, like this one

  • Folding travel stroller

    This stroller is only 10 lbs and folds to the size of a big book.

  • Travel pillow

    Our fave is this one

  • Travel voltage adapter

    A plug adapter that supports outlet types A and B. Ensure that you pick the necessary kind. The majority of adapters that you can buy are just plug changers and require your devices to change the voltage themselves. If yours can't do that they could get fried. This one should be sufficient for most locations.

  • Airplane phone mount

    Make your flight more comfortable with an airplane phone mount

December

December in Contra Costa County is chilly. The average overnight temperatures in the area are in 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 peace of mind, an anti-theft backpack protects your things.

  • Voice and data SIM card

    A SIM card that works in Contra Costa County. 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

  • Travel neck pillow

    A good option is this one

  • Power bank for devices

    A portable power bank, like this one

  • Travel adapter

    A plug adapter that supports outlet types A and B. It's important that you choose the necessary type. Many adapters currently available are just plugs and require your electronics to change the voltage themselves. If your devices can't do that they could get fried. This one should be sufficient for most countries.

  • Super portable foldable travel stroller

    This stroller is only 10 pounds and folds to the size of a big book.

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.

Check out our guides for these other locations: Shodoshima, Japan, Crestone, Colorado, United States of America, Hayward, California, United States of America, Awa, Japan, Ermioni, Greece, Soest, Netherlands, Grove, Oklahoma, United States of America, Nuevo León, Nuevo León, Mexico, Popoyo, Nicaragua, Tipaza, Algeria, and Machhiwara, India.