Climate

Climate in Santa Rosa, United States

Santa Rosa, United States has a mediterranean climate. The annual average temperature is about 17.6°C, with around 2804 hours of sunshine; the national rainfall baseline is roughly 549 mm across 61 rainy days a year. The warmest month is Jul (highs near 28.4°C) and the coldest is Jan (lows near 6.8°C). These are deterministic planning estimates, not a forecast or measured station data. Temperature and sunshine follow the city's latitude; rainfall and the climate zone come from a country-level baseline that every city in the country shares (refined by region in the United States, Canada and Australia), so they do not show local differences. Check current conditions with an official meteorological service before travel.

Climate zone
Mediterranean
Comfort score
96/100

Climate overview

Santa Rosa, United States has a mediterranean climate. The annual average temperature is about 17.6°C, with around 2804 hours of sunshine; the national rainfall baseline is roughly 549 mm across 61 rainy days a year. The warmest month is Jul (highs near 28.4°C) and the coldest is Jan (lows near 6.8°C). These are deterministic planning estimates, not a forecast or measured station data. Temperature and sunshine follow the city's latitude; rainfall and the climate zone come from a country-level baseline that every city in the country shares (refined by region in the United States, Canada and Australia), so they do not show local differences. Check current conditions with an official meteorological service before travel.

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

Climate zone

Köppen-style classification derived deterministically from latitude and a country-level precipitation baseline.

Climate zone

Santa Rosa is classified as Mediterranean. The classification combines the city’s own temperature range, which follows its latitude, with a rainfall pattern taken at country level for United States — so cities in the same country usually share a zone.

Average temperatures

Annual averages and seasonal extremes.

Average temperatures

  • Annual average17.6°C
  • Warmest monthJul (28.4°C)
  • Coldest monthJan (6.8°C)
  • Comfort score96/100

Rainfall overview

A country-level precipitation baseline and how it is distributed across the year.

Rainfall overview

The rainfall baseline for United States is about 549 mm a year over roughly 61 rainy days, with the wettest month Dec and the driest Jul. This figure is not specific to Santa Rosa: every city in United States carries the same baseline, so it will not show the difference between, say, a dry inland city and a wet coastal one. Use an official meteorological service for local rainfall.

Sunshine overview

Estimated annual sunshine and its seasonal pattern.

Sunshine overview

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

Monthly climate table

Month-by-month estimates. Temperature and sunshine follow the city’s latitude; the rainfall and rainy-day columns distribute the country-level baseline.

Monthly climate table

Santa Rosa monthly climate table
MonthHighLowRainRainy DaysSunshine
Jan16.8°C6.8°C78 mm9133 h
Feb17.6°C7.6°C65 mm7160 h
Mar19.7°C9.7°C54 mm6190 h
Apr22.6°C12.6°C43 mm5230 h
May25.5°C15.5°C27 mm3288 h
Jun27.6°C17.6°C11 mm1342 h
Jul28.4°C18.4°C4 mm0351 h
Aug27.6°C17.6°C11 mm1342 h
Sep25.5°C15.5°C32 mm4273 h
Oct22.6°C12.6°C62 mm7203 h
Nov19.7°C9.7°C78 mm9154 h
Dec17.6°C7.6°C84 mm9138 h

Best months to visit

Months with the mildest temperatures and lower rainfall, by the deterministic comfort heuristic. Not a tourism ranking.

Best months to visit

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.

Seasonal summary

Average conditions by season.

Seasonal summary

  • Winter

    17°C / 7°C

    227 mm rain

  • Spring

    23°C / 13°C

    124 mm rain

  • Summer

    28°C / 18°C

    26 mm rain

  • Autumn

    23°C / 13°C

    172 mm rain

Climate comfort score

A 0–100 composite of temperature balance, rainfall, sunshine, seasonality, and winter/summer extremes; higher means more comfortable. Used consistently across the platform.

Climate comfort score

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.

Continue exploring

Continue researching this city across the platform's other planning surfaces.

Continue exploring

Related guides

Keep exploring Santa Rosa across the rest of the dataset — its full profile, travel guides and nearby nature.

Santa Rosa city profileFull intelligence profile with quick answers, FAQs and every indexed dimension.Weekend trips from Santa RosaCurated nearby getaways and day trips within easy reach.Nature near Santa RosaVerified parks, lakes, coasts and uplands within ~170 km.Santa Rosa visual guideA visual orientation to the city and its surroundings.