El Cajon Average Temperature by Month

This page shows the average temperature in each month of the year in El Cajon, California. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in El Cajon?
In El Cajon, California, the warmest month is August, with an average daily high temperature of 89.1 °F and an average low of 65.1 °F.
What's the Coldest Month in El Cajon?
In El Cajon, California, the coolest month is January, with an average daily high temperature of 70.4 °F and an average low of 42.9 °F.
Month Avg. High Avg. Low
January 70.4 °F 42.9 °F
February 69.8 °F 44.6 °F
March 71.9 °F 48.1 °F
April 75.6 °F 51.2 °F
May 76.7 °F 56.1 °F
June 81.8 °F 59.5 °F
July 86.8 °F 63.5 °F
August 89.1 °F 65.1 °F
September 88.5 °F 62.5 °F
October 81.9 °F 55.9 °F
November 75.6 °F 47.1 °F
December 69.4 °F 42.6 °F
Year 78.1 °F 53.4 °F
Weather Station Details
Years Station Coordinates
1979–2024 El Cajon location
1899–1979 El Cajon 2 E location