Climate
Santa Rosa weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: July, August, September, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 60°F | 38°F | 5.8 in | 14 |
| February | 64°F | 40°F | 6.4 in | 13 |
| March | 67°F | 42°F | 4.3 in | 12 |
| April | 71°F | 44°F | 2.0 in | 8 |
| May | 75°F | 48°F | 1.3 in | 5 |
| June | 80°F | 51°F | 0.30 in | 1 |
| July | 82°F | 52°F | 0.00 in | 0 |
| August | 83°F | 53°F | 0.00 in | 0 |
| September | 84°F | 51°F | 0.10 in | 1 |
| October | 79°F | 48°F | 1.6 in | 4 |
| November | 67°F | 42°F | 3.2 in | 9 |
| December | 59°F | 38°F | 6.5 in | 13 |
NOAA U.S. Climate Normals 1991–2020, Santa Rosa, Ca Us (1.1 mi away, 166 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Santa Rosa?
September, with an average high of 84°F and low of 51°F.
What is the coldest month in Santa Rosa?
December, with an average low of 38°F and high of 59°F.
When does it rain most in Santa Rosa?
December is the wettest month, averaging 6.5 in of precipitation; the year totals about 31.5 inches.
What is the best time to visit Santa Rosa?
For mild weather (highs between 65°F and 85°F) with the least rain, July, August, September.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Santa Rosa weather station, 1.1 miles from downtown: 30-year averages, not a forecast.