Weatheo

Santa Rosa Weather by Month

Average temperatures, rainfall and humidity for Santa Rosa, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Santa Rosa month looks like before you travel — then check the live Santa Rosa forecast for the days ahead.

Warmest month

July

29°C average high

Coolest month

December

6°C average low

Wettest month

December

124 mm of rain

Driest month

August

6 mm of rain

Average temperature and rainfall in Santa Rosa by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January15°C6°C-4°C / 26°C
73 mm
81%8 km/h
February17°C6°C-3°C / 26°C
82 mm
78%9 km/h
March19°C7°C0°C / 33°C
65 mm
76%9 km/h
April21°C8°C1°C / 32°C
35 mm
74%10 km/h
May24°C10°C2°C / 35°C
19 mm
70%11 km/h
June28°C12°C6°C / 39°C
13 mm
67%10 km/h
July29°C13°C8°C / 39°C
7 mm
69%9 km/h
August29°C13°C9°C / 40°C
6 mm
71%8 km/h
September28°C13°C7°C / 45°C
11 mm
70%8 km/h
October25°C10°C3°C / 41°C
27 mm
70%7 km/h
November19°C7°C-1°C / 29°C
57 mm
77%7 km/h
December15°C6°C-5°C / 27°C
124 mm
82%8 km/h

Best time to visit Santa Rosa

The most comfortable time to visit Santa Rosa is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around December, totalling about 519 mm a year.

Travellers who prefer heat should aim for July, when highs average 29°C. December is the month to avoid if rain would spoil your plans — it averages 124 mm, roughly 22× the rainfall of the driest month (August).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Santa Rosa forecast for what is happening now.

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