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Santa Rosa (CA)
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United States weather

Weather in Santa Rosa, California for December 2026

Your guide to Santa Rosa weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Santa Rosa at the beginning of December is 15.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 12.9 °C by the end of December.

    • Rain 🌧️

  • Santa Rosa experiences moderate rainfall in December, with an average of 10 rainy days and a total precipitation of 371.5 mm.

    • More

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

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

Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
14°/7°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Santa Rosa Weather December

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

Temperatures trend during December in Santa Rosa

See the weather trend as well as the moving average line

December weather in Santa Rosa day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Overcast
Overcast
 16° /4° 0 mm 2.2
Dec. 2 Fog
Fog
 16° /7° 0.1 mm 2.2
Dec. 3 Fog
Fog
 16° /7° 0.1 mm 2.2
Dec. 4 Fog
Fog
 16° /6° 0 mm 2.2
Dec. 5 Fog
Fog
 15° /7° 0 mm 2.2
Dec. 6 Light rain
Light rain
 15° /7° 5.3 mm 2.1
Dec. 7 Light rain shower
Light rain shower
 13° /6° 1.1 mm 2.1
Dec. 8 Mist
Mist
 14° /5° 0 mm 2.1
Dec. 9 Mist
Mist
 15° /3° 0 mm 2.1
Dec. 10 Overcast
Overcast
 16° /4° 0 mm 2.1
Dec. 11 Sunny
Sunny
 17° /4° 0 mm 2.1
Dec. 12 Moderate rain
Moderate rain
 16° /7° 16.6 mm 2.1
Dec. 13 Cloudy
Cloudy
 16° /7° 0.5 mm 2.1
Dec. 14 Heavy rain
Heavy rain
 14° /6° 59.9 mm 2
Dec. 15 Sunny
Sunny
 13° /4° 0 mm 2
Dec. 16 Moderate rain
Moderate rain
 16° /7° 10.2 mm 2
Dec. 17 Patchy rain possible
Patchy rain possible
 15° /9° 1.5 mm 2
Dec. 18 Light rain
Light rain
 12° /7° 5.6 mm 2
Dec. 19 Moderate rain
Moderate rain
 14° /9° 12.1 mm 2
Dec. 20 Heavy rain
Heavy rain
 12° /9° 25.9 mm 2
Dec. 21 Heavy rain
Heavy rain
 14° /10° 67 mm 2
Dec. 22 Light rain
Light rain
 15° /9° 4 mm 2
Dec. 23 Moderate rain
Moderate rain
 14° /9° 15.9 mm 2
Dec. 24 Heavy rain
Heavy rain
 13° /8° 33.4 mm 2
Dec. 25 Heavy rain
Heavy rain
 12° /7° 32.5 mm 2
Dec. 26 Moderate rain
Moderate rain
 14° /9° 21.5 mm 2
Dec. 27 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 13° /8° 18.4 mm 2
Dec. 28 Patchy rain possible
Patchy rain possible
 13° /7° 1.2 mm 2
Dec. 29 Moderate rain
Moderate rain
 14° /6° 24.7 mm 2.1
Dec. 30 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 13° /5° 2.3 mm 2
Dec. 31 Moderate rain
Moderate rain
 11° /5° 11.5 mm 2
Next
Important Notice
Our weather forecast for Santa Rosa 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 Santa Rosa forecast closer to your planned date for the most up-to-date weather information.
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Santa Rosa in December - FAQ

What are the expected maximum and minimum temperatures in Santa Rosa during December?
During December, expect a variety of temperatures with highs around 14° and lows near 7°, suitable for diverse activities and preferences.

How much rainfall should be expected in Santa Rosa during December?
Significant rainfall exceeding 371.5 mm is expected in Santa Rosa during December, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Santa Rosa during December?
The average wind speed in Santa Rosa during December is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Santa Rosa

Explore the daily rainfall trends and prepare for Santa Rosas December weather 💧
Typically, Santa Rosa has 10 rainy days in December with a total of 371.5 mm of rainfall.
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Location coordinates Where is Santa Rosa?

Get accurate weather forecasts for Santa Rosa, located at latitude 38.44 and longitude -122.714. Stay updated with localized weather information tailored for Santa Rosa.

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