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Sunnyvale (CA)
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United States weather

Weather in Sunnyvale, California for December 2026

Your guide to Sunnyvale weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Sunnyvale at the beginning of December is 16.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 13.7 °C by the end of December.

    • Rain 🌧️

  • Sunnyvale experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 163.4 mm.

    • More

  • Is December a good time to visit Sunnyvale? check out the best time to travel to Sunnyvale page.

  • ✨ Is December a good time to visit Sunnyvale? – Ask the AI Weatherman

Average dry days
24
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/8°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Sunnyvale Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Mist
17°
2
Patchy rain possible
17°
3
Mist
17°
4
Mist
17°
5
Mist
18°
6
Light rain
17°
7
Light rain shower
14°
8
Mist
13°
9
Cloudy
13°
10
Overcast
17°
11
Overcast
17°
12
Light rain
16°
13
Overcast
16°
14
Moderate rain
15°
15
Sunny
14°
16
Partly cloudy
15°
17
Fog
17°
18
Light rain
15°
19
Moderate or heavy rain with thunder
16°
20
Light rain
15°
21
Moderate rain
14°
22
Moderate rain
16°
23
Partly cloudy
15°
24
Heavy rain
14°
25
Moderate rain
13°
26
Cloudy
14°
27
Light rain
13°
28
Patchy rain possible
15°
29
Light rain
15°
30
Light rain shower
14°
31
Light rain
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
 17° /7° 0 mm 2.4
Dec. 2 Patchy rain possible
Patchy rain possible
 17° /7° 0 mm 2.4
Dec. 3 Mist
Mist
 17° /7° 0 mm 2.4
Dec. 4 Mist
Mist
 17° /8° 0 mm 2.4
Dec. 5 Mist
Mist
 18° /7° 0 mm 2.3
Dec. 6 Light rain
Light rain
 17° /8° 0.7 mm 2.3
Dec. 7 Light rain shower
Light rain shower
 14° /7° 0.7 mm 2.3
Dec. 8 Mist
Mist
 13° /7° 0 mm 2.3
Dec. 9 Cloudy
Cloudy
 13° /5° 0 mm 2.3
Dec. 10 Overcast
Overcast
 17° /5° 0 mm 2.3
Dec. 11 Overcast
Overcast
 17° /7° 0 mm 2.3
Dec. 12 Light rain
Light rain
 16° /9° 6.5 mm 2.2
Dec. 13 Overcast
Overcast
 16° /8° 0 mm 2.2
Dec. 14 Moderate rain
Moderate rain
 15° /7° 20.6 mm 2.2
Dec. 15 Sunny
Sunny
 14° /6° 0 mm 2.2
Dec. 16 Partly cloudy
Partly cloudy
 15° /9° 0 mm 2.2
Dec. 17 Fog
Fog
 17° /10° 0 mm 2.2
Dec. 18 Light rain
Light rain
 15° /8° 4.5 mm 2.2
Dec. 19 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 16° /10° 6.2 mm 2.2
Dec. 20 Light rain
Light rain
 15° /12° 9 mm 2
Dec. 21 Moderate rain
Moderate rain
 14° /11° 19.3 mm 2.2
Dec. 22 Moderate rain
Moderate rain
 16° /11° 17.7 mm 2.2
Dec. 23 Partly cloudy
Partly cloudy
 15° /10° 0.9 mm 2.2
Dec. 24 Heavy rain
Heavy rain
 14° /9° 29.1 mm 2
Dec. 25 Moderate rain
Moderate rain
 13° /8° 23.4 mm 2.2
Dec. 26 Cloudy
Cloudy
 14° /9° 0.9 mm 2
Dec. 27 Light rain
Light rain
 13° /9° 9.2 mm 2
Dec. 28 Patchy rain possible
Patchy rain possible
 15° /8° 0.1 mm 2.2
Dec. 29 Light rain
Light rain
 15° /6° 5.7 mm 2.2
Dec. 30 Light rain shower
Light rain shower
 14° /6° 1.8 mm 2
Dec. 31 Light rain
Light rain
 12° /7° 7.2 mm 2
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 163.4 mm is expected in Sunnyvale during December, occurring over more than 7 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 7 rainy days in December with a total of 163.4 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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