Climate in Santa Rosa

Santa Rosa, United States has a mediterranean climate. The annual average temperature is about 17.6°C and the city receives roughly 549 mm of precipitation across 61 rainy days a year, with around 2804 hours of sunshine. The warmest month is Jul (highs near 28.4°C) and the coldest is Jan (lows near 6.8°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Santa Rosa is classified as Mediterranean. This reflects its annual temperature range and the seasonal pattern of its rainfall.

Santa Rosa receives about 549 mm of precipitation a year over roughly 61 rainy days. The wettest month is Dec and the driest is Jul.

Santa Rosa sees an estimated 2804 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Santa Rosa are Jul, Jun, Aug. Conditions vary year to year — verify with a current forecast before booking.

Santa Rosa has a climate comfort score of 96/100, a very comfortable year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.

• Climate in San Francisco — Mediterranean, comfort 96/100
• Climate in Sacramento — Mediterranean, comfort 96/100
• Climate in Santa Cruz — Mediterranean, comfort 96/100