California weather

Our guide to the weather in California destination during December


Average high


UV Index


Monthly rainfall



We've looked at the most up-to-date weather data for California, covering the last 12 years up to 2023, 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 December.

What's the temperature like in California during December?

December is typically the coolest month in California. The temperature reaches around 13℃ during the daytime, 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 December?

On average, there will be 4 rainy days during the month, amounting to 107.7mm 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 December?

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

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