Sunnyvale
December
Weather in Sunnyvale for December 2025
Your guide to Sunnyvale weather in December - trends and predictions
In general, the average temperature in Sunnyvale at the beginning of December is 17.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.9 °F by the end of December.
Sunnyvale experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 84.4 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
16°/9°
Temperatures
8 km/h
Avg max wind
70 %
Avg humidity
Sunnyvale in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  18° | 2  17° | 3 18° | 4 17° | 5 19° | 6  17° | |
| 7 15° | 8  15° | 9 15° | 10  17° | 11 16° | 12 14° | 13 14° |
| 14 15° | 15  14° | 16  15° | 17 17° | 18 14° | 19  18° | 20 15° |
| 21 14° | 22 17° | 23 15° | 24 15° | 25 13° | 26 15° | 27 15° |
| 28 16° | 29 14° | 30 12° | 31 12° |
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Temperatures trend during December in Sunnyvale
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 | Mist | 18° /8° | 0 mm | 5 | |
| Dec. 2 | Patchy rain possible | 17° /9° | 0 mm | 5 | |
| Dec. 3 | Mist | 18° /8° | 0 mm | 5 | |
| Dec. 4 | Mist | 17° /9° | 0 mm | 4 | |
| Dec. 5 | Mist | 19° /8° | 0 mm | 5 | |
| Dec. 6 | Light rain | 17° /8° | 1 mm | 4 | |
| Dec. 7 | Light rain shower | 15° /7° | 1.1 mm | 4 | |
| Dec. 8 | Cloudy | 15° /6° | 0 mm | 4 | |
| Dec. 9 | Cloudy | 15° /4° | 0 mm | 3 | |
| Dec. 10 | Overcast | 17° /4° | 0 mm | 4 | |
| Dec. 11 | Overcast | 16° /7° | 0 mm | 5 | |
| Dec. 12 | Overcast | 14° /9° | 9.8 mm | 4 | |
| Dec. 13 | Overcast | 14° /8° | 0 mm | 4 | |
| Dec. 14 | Overcast | 15° /8° | 30.9 mm | 4 | |
| Dec. 15 | Sunny | 14° /7° | 0 mm | 4 | |
| Dec. 16 | Partly cloudy | 15° /7° | 0 mm | 4 | |
| Dec. 17 | Patchy rain possible | 17° /9° | 0 mm | 4 | |
| Dec. 18 | Light rain shower | 14° /9° | 6.7 mm | 3 | |
| Dec. 19 | Moderate or heavy rain with thunder | 18° /9° | 9.3 mm | 5 | |
| Dec. 20 | Light rain shower | 15° /11° | 13.5 mm | 4 | |
| Dec. 21 | Partly cloudy | 14° /9° | 0 mm | 4 | |
| Dec. 22 | Sunny | 17° /10° | 0 mm | 5 | |
| Dec. 23 | Partly cloudy | 15° /9° | 0 mm | 5 | |
| Dec. 24 | Overcast | 15° /8° | 30.8 mm | 4 | |
| Dec. 25 | Partly cloudy | 13° /6° | 0 mm | 4 | |
| Dec. 26 | Cloudy | 15° /8° | 0 mm | 4 | |
| Dec. 27 | Light rain shower | 15° /10° | 13.9 mm | 4 | |
| Dec. 28 | Patchy rain possible | 16° /11° | 0.2 mm | 4 | |
| Dec. 29 | Light rain | 14° /9° | 8.6 mm | 4 | |
| Dec. 30 | Light rain shower | 12° /7° | 2.6 mm | 3 | |
| Dec. 31 | Light rain shower | 12° /5° | 0.5 mm | 3 | |
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Important Notice
Our weather forecast for Sunnyvale in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Sunnyvale forecast closer to your planned date for the most up-to-date weather information.
Sunnyvale in December - FAQ
What are the expected maximum and minimum temperatures in Sunnyvale during December?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sunnyvale during December?
Moderate rainfall is anticipated in Sunnyvale during December, with a total of 84.4 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Sunnyvale during December?
The average wind speed in Sunnyvale during December is 8 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Sunnyvale
Explore the daily rainfall trends and prepare for Sunnyvales December weather 💧
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