Santa Rosa Average Temperature by Month

This page shows the average temperature in each month of the year in Santa Rosa, California. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Santa Rosa?
In Santa Rosa, California, the warmest month is August, with an average daily high temperature of 83.5 °F and an average low of 52.5 °F.
What's the Coldest Month in Santa Rosa?
In Santa Rosa, California, the coolest month is January, with an average daily high temperature of 58.1 °F and an average low of 38.2 °F.
Month Avg. High Avg. Low
January 58.1 °F 38.2 °F
February 61.7 °F 40.2 °F
March 65.2 °F 42.1 °F
April 69.0 °F 44.1 °F
May 74.3 °F 47.6 °F
June 81.0 °F 50.8 °F
July 82.7 °F 52.3 °F
August 83.5 °F 52.5 °F
September 82.9 °F 50.4 °F
October 77.3 °F 46.6 °F
November 65.7 °F 41.2 °F
December 57.7 °F 37.7 °F
Year 71.6 °F 45.4 °F
Weather Station Details
Years Station Coordinates
1998–2024 Santa Rosa Sonoma County Airport location
1902–1998 Santa Rosa location