Santa Rosa Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from very warm to pleasant in Santa Rosa. Typically, average maximum daytime temperatures range from a very warm 32°C (90°F) in January to a pleasant 19°C (66°F) in the coolest month, July.

Nights vary from 20°C (68°F) in January to around 8°C (46°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Santa Rosa has a relatively rainy climate with high precipitation levels, averaging 1199 mm (47 in) of rainfall annually. The climate in Santa Rosa shows significant variation throughout the year. Expect high rainfall in February, the wettest month, with an average of 135 mm (5.3 in) of precipitation over 7 rainy days.

In contrast, the driest month July offers drier and sunnier days, with around 44 mm (1.7 in) of rainfall over 6 rainy days. 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

For those who appreciate different seasons, Santa Rosa serves as an ideal destination. Expect longer, more sun-filled days in January with an average of 9.0 hours of sunshine daily, and embrace the darker days in June, offering only 4.4 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Santa Rosa.

The city experiences its highest humidity in June, reaching 84%. In December, the humidity drops to its lowest level at 70%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year