California weather

Our guide to the weather in California during January

15

Average high

3

UV Index

118mm

Monthly rainfall

63%

Humidity

We've looked at the most up-to-date weather data for California, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about California weather in January.

What's the temperature like in California during January?

The temperature reaches around 15℃ during the daytime in January, falling away to 6℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in California during January?

On average, there will be 5 rainy days during the month, amounting to 118.1mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in California during January?

No - there is very light air movement in January so conditions should be calm with light breezes at times.

Join the club...

Be the first to hear about discounted holidays, flash sales and amazing travel competitions to California!

California Blog posts

From the top US travel bloggers

...

Staying at Fieldtrip Casa Blanca in Joshua Tree

30th January 2023 by The Blonde Abroad

Are you dreaming of a desert getaway in Joshua Tree? We've found the perfect place for a family staycation and we want to share it with you!...

...

The best hotels to stay at in San Diego

11th July 2022 by The Blonde Abroad

Even though San Diego is home for me, I love planning staycations in “American’s finest city.” I relish the opportunity to show people around my stomping grounds. That’s why I created my ultimate San Diego Travel Guide to help you get your bearings and plan your perfect San Diego itinerary. From the best restaurants in San Diego to the best brunch places in San Diego and everything in between, I encourage you to plan a trip to this coastal city. Find your new favorite brewery,...

...

10 things to do in San Francisco (that aren’t the Golden Gate Bridge) 

29th March 2022 by The Blonde Abroad

San Francisco is one of the true cultural capitals of the United States. Packed with world-class museums, a rich countercultural history, fabulous art galleries, and more wonders that you can explore in a lifetime, this city can truly be everything to everyone. Even if you’ve never explored the City by the Bay, you probably can name countless historical sites and iconic spots around town. Now, it’s time to dig deeper. Eat with the locals, travel off the beaten path, and see a fresh side of...

Weather in California

Our month-by-month guide to the weather and climate in California

14.8

California weather in

January
15.9

California weather in

February
18.4

California weather in

March
22.0

California weather in

April
26.6

California weather in

May
33.4

California weather in

June
37.5

California weather in

July
36.9

California weather in

August
33.8

California weather in

September
26.2

California weather in

October
18.8

California weather in

November
13.4

California weather in

December