Santa Rosa, California, United States climate
Average temperatures, precipitation and all-time records for Santa Rosa, California, United States, with every day graded against ~46 years of local climate history (1980–2026). Its warmest month is July, averaging a high of 85°F, and its coldest is December, with an average low of 40°F.
Santa Rosa is a city in and the county seat of Sonoma County, United States, in the North Bay region of the Bay Area in California. Its population as of the 2020 census was 178,127. It is the largest city in California's Wine Country and Redwood Coast. via Wikipedia
How today compares
Latest recorded day: 2026-07-24. Each reading placed on Santa Rosa, California, United States's own ±7-day seasonal distribution.
Santa Rosa average temperatures by month
Typical daily high and low, and average precipitation, for each month in Santa Rosa, California, United States, based on 1980–2026 records. The wettest month is January (0.20 in on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 58°F | 40°F | 0.20 in |
| February | 61°F | 42°F | 0.20 in |
| March | 64°F | 44°F | 0.20 in |
| April | 68°F | 46°F | 0.10 in |
| May | 75°F | 51°F | 0.00 in |
| June | 82°F | 55°F | 0.00 in |
| July | 85°F | 58°F | 0.00 in |
| August | 84°F | 57°F | 0.00 in |
| September | 82°F | 56°F | 0.00 in |
| October | 76°F | 51°F | 0.00 in |
| November | 64°F | 44°F | 0.10 in |
| December | 57°F | 40°F | 0.20 in |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 108°F on 2022-09-06
- Coldest day on record: 23°F on 1990-12-25
Percentiles compare each day to Santa Rosa, California, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →