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Sunnyvale (CA)
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United States weather

Weather in Sunnyvale, California for December 2025

Your guide to Sunnyvale weather in December - trends and predictions

    Temperatures

  • Until now, December 2025 in Sunnyvale has been nearly identical to the historical average, with a temperature of 16.6 °F (showing only a slight deviation of 0.1 °F).

  • The forecast for the next days in Sunnyvale predicts temperatures to be around 16 °F, close to the historical average.

  • In general, the average temperature in Sunnyvale at the beginning of December is 17 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.3 °F by the end of December.

    • Rain 🌧️

  • 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.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
20
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/8°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Sunnyvale Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Mist
18°
2
Patchy rain possible
17°
3
Mist
17°
4
Mist
17°
5
Mist
18°
6
Light rain
17°
7
Light rain shower
15°
8
Mist
14°
9
Cloudy
14°
10
Overcast
18°
11
Overcast
17°
12
Overcast
17°
13
Overcast
17°
14
Overcast
15°
15
Sunny
15°
16
Partly cloudy
18°
17
Patchy rain possible
16°
18
Mist
18°
19
Mist
15°
20
Patchy rain possible
20°
21
Patchy rain possible
16°
22
Patchy rain possible
17°
23
Patchy rain possible
16°
24
Moderate rain
14°
25
Patchy rain possible
12°
26
Patchy rain possible
13°
27
Sunny
13°
28
Sunny
15°
29
Sunny
16°
30
Light rain shower
12°
31
Light rain shower
12°

Temperatures trend during December in Sunnyvale

See the weather trend as well as the moving average line

December weather in Sunnyvale day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Mist
Mist
 18° /6° 0 mm 4
Dec. 2 Patchy rain possible
Patchy rain possible
 17° /7° 0 mm 4
Dec. 3 Mist
Mist
 17° /7° 0 mm 4
Dec. 4 Mist
Mist
 17° /8° 0 mm 4
Dec. 5 Mist
Mist
 18° /7° 0 mm 5
Dec. 6 Light rain
Light rain
 17° /8° 0.7 mm 4
Dec. 7 Light rain shower
Light rain shower
 15° /7° 0.7 mm 3
Dec. 8 Mist
Mist
 14° /6° 0 mm 3
Dec. 9 Cloudy
Cloudy
 14° /5° 0 mm 3
Dec. 10 Overcast
Overcast
 18° /5° 0 mm 4
Dec. 11 Overcast
Overcast
 17° /7° 0 mm 5
Dec. 12 Overcast
Overcast
 17° /9° 6.5 mm 4
Dec. 13 Overcast
Overcast
 17° /8° 0 mm 4
Dec. 14 Overcast
Overcast
 15° /7° 20.6 mm 4
Dec. 15 Sunny
Sunny
 15° /6° 0 mm 4
Dec. 16 Partly cloudy
Partly cloudy
 18° /6° 0 mm 0.5
Dec. 17 Patchy rain possible
Patchy rain possible
 16° /10° 1.5 mm 0.3
Dec. 18 Mist
Mist
 18° /6° 0 mm 0.4
Dec. 19 Mist
Mist
 15° /9° 0 mm 0.5
Dec. 20 Patchy rain possible
Patchy rain possible
 20° /14° 2.9 mm 0.4
Dec. 21 Patchy rain possible
Patchy rain possible
 16° /15° 4.6 mm 0
Dec. 22 Patchy rain possible
Patchy rain possible
 17° /12° 0.2 mm 3
Dec. 23 Patchy rain possible
Patchy rain possible
 16° /13° 0.3 mm 3
Dec. 24 Moderate rain
Moderate rain
 14° /11° 15 mm 3
Dec. 25 Patchy rain possible
Patchy rain possible
 12° /9° 3 mm 3
Dec. 26 Patchy rain possible
Patchy rain possible
 13° /6° 0.2 mm 2
Dec. 27 Sunny
Sunny
 13° /5° 0 mm 3
Dec. 28 Sunny
Sunny
 15° /6° 0 mm 4
Dec. 29 Sunny
Sunny
 16° /7° 0 mm 4
Dec. 30 Light rain shower
Light rain shower
 12° /7° 2.6 mm 3
Dec. 31 Light rain shower
Light rain shower
 12° /5° 0.5 mm 3
Next
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.
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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 💧
Typically, Sunnyvale has 11 rainy days in December with a total of 128.8 mm of rainfall.

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Location coordinates Where is Sunnyvale?

Get accurate weather forecasts for Sunnyvale, located at latitude 37.369 and longitude -122.036. Stay updated with localized weather information tailored for Sunnyvale.

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