Santa Rosa (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Santa Rosa.
Climate overview of Santa Rosa
The climate in Santa Rosa, California, United States of America, is marked by large temperature swings across the seasons, ranging from 28°C (82°F) in September to 14°C (57°F) in January.
The city receives around 713 mm (28 in) of rainfall per year. It experiences a distinct dry season from May to September. December is the wettest month and August the driest. Sunshine peaks in May, when the city sees around 10.3 hours of sunshine per day.
Santa Rosa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Santa Rosa — and find the best time to visit.
Monthly Temperature in Santa Rosa
In Santa Rosa, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 28°C (82°F) in September to a moderate 14°C (57°F) in January.
Nighttime temperatures range from 11°C (52°F) in September to 4°C (39°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Santa Rosa
On average, Santa Rosa receives a reasonable amount of rainfall, with an annual precipitation of 713 mm (28 in). The seasons in Santa Rosa bring significant changes in precipitation. The wettest month, December, receives high rainfall, with an average of 145 mm (5.7 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, August, experiences much less rainfall, totaling 0.3 mm (0.01 in) over a single rainy day. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Santa Rosa Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Santa Rosa
In Santa Rosa, summer days are longer and more sunny, with daily sunshine hours peaking at 10.3 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Best Time to Visit Santa Rosa
Frequently asked questions about the climate in Santa Rosa
What is the best time to visit Santa Rosa?
April, May, June, July, August, September and October typically offer the most optimal weather in Santa Rosa. In contrast, January, February and December tend to have less optimal conditions. Santa Rosa has a distinct dry season from May to September.
What temperatures can I expect in Santa Rosa?
Daytime highs range from 14°C (57°F) in January to 28°C (82°F) in September. Nighttime lows range from 4°C (39°F) to 11°C (52°F). Temperatures vary considerably through the year.
How much rain does Santa Rosa get?
Annual rainfall is around 713 mm (28 in). December is the wettest month with 145 mm (5.7 in), while August is the driest with 0.3 mm (0.01 in).
How sunny is Santa Rosa?
Santa Rosa receives around 3,042 hours of sunshine per year. May is the sunniest month with 310 hours, while December is the cloudiest with just 160 hours. Overall, Santa Rosa enjoys abundant sunshine.
Santa Rosa 3-Day Forecast
Santa Rosa (CA) 3-Day Forecast
Santa Rosa on the map
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