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.
The climate of Sunnyvale in December is notably wet, with an average of 11 rainy days, and a total of 128.8 mm of precipitation.
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Temperatures
Rain 🌧️
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20
Dry days
11
Rainy days
0
Snow days
15°/8°
Temperatures
9 km/h
Avg max wind
74 %
Avg humidity
Sunnyvale Weather December
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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?
During December, expect a variety of temperatures with highs around 15° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sunnyvale during December?
Significant rainfall exceeding 128.8 mm is expected in Sunnyvale during December, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sunnyvale during December?
The average wind speed in Sunnyvale during December is 9 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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