Vacaville Average Temperature by Month

This page shows the average temperature in each month of the year in Vacaville, California. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Vacaville?
In Vacaville, California, the warmest month is July, with an average daily high temperature of 95.1 °F and an average low of 59.5 °F.
What's the Coldest Month in Vacaville?
In Vacaville, California, the coolest month is January, with an average daily high temperature of 57.1 °F and an average low of 38.3 °F.
Month Avg. High Avg. Low
January 57.1 °F 38.3 °F
February 62.1 °F 41.0 °F
March 67.3 °F 43.9 °F
April 72.8 °F 46.8 °F
May 80.8 °F 51.8 °F
June 89.3 °F 56.9 °F
July 95.1 °F 59.5 °F
August 93.9 °F 58.5 °F
September 90.2 °F 56.1 °F
October 80.1 °F 50.2 °F
November 66.3 °F 42.6 °F
December 57.4 °F 38.0 °F
Year 76.0 °F 48.6 °F
Weather Station Details
Years Station Coordinates
1999–2024 Vacaville Nut Tree Airport location
1893–1998 Vacaville location