Sunnyvale weather in December (California, United States of America)

Is December a good time to explore Sunnyvale weather-wise? Use this page to get an overview of the month’s weather conditions.

Temperatures

Typically, December in Sunnyvale includes moderate temperatures and moderate rainfall. December is part of the winter season. Expect daytime highs to reach approximately 15°C, with nighttime lows dipping to around 5°C. With the most moderate temperatures of the year, December offers a break from extremes.

Precipitation

Sunnyvale in December usually receives moderate rainfall, averaging around 70 mm for the month. With this being the rainiest month, having an umbrella is essential to avoid unexpected rain. Typically around 11 days days of rainfall are expected.

Average sunshine

The month experiences a moderate amount of sunlight, with 160 hours hours. A nice balance between sunshine and clouds.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Sunnyvale. April, May, June, July, August, September and October typically offer the most agreeable circumstances. On the other hand, January, February and December tend to be characterized by conditions that may not be as optimal.

For an in-depth look at the yearly conditions, visit our specialized Sunnyvale climate page with graphs.

 

Sunnyvale, monthly averages in December

Min Temperature 5°C  

Max Temperature 15°C  

Chance of Rain 36%  

Precipitation 70 mm  

Rainy days 11 days  

Humidity 78% *  

Sunshine 160 hours *  

Percentage Sunshine 54% *  

* Data from: San Francisco, the United States of America (41 KM, 25 Miles).

Where to go in the United States of America in December

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

Plan on layering your clothes. Some days or part of the day it will be nice and warm and some moments it can be a bit chilly. Bring a rain jacket in case it rains during your stay.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Sunnyvale.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.