London Average Temperature by Month

This page shows the average temperature in each month of the year in London, Ontario. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in London?
In London, Ontario, the warmest month is July, with an average daily high temperature of 26.6 °C and an average low of 15.3 °C.
What's the Coldest Month in London?
In London, Ontario, the coolest month is January, with an average daily high temperature of -1.6 °C and an average low of -9.1 °C.
Month Avg. High Avg. Low
January -1.6 °C -9.1 °C
February -0.6 °C -9.0 °C
March 4.6 °C -4.4 °C
April 12.2 °C 1.4 °C
May 19.3 °C 7.6 °C
June 24.4 °C 13.2 °C
July 26.6 °C 15.3 °C
August 25.7 °C 14.4 °C
September 22.0 °C 10.5 °C
October 14.7 °C 5.0 °C
November 7.5 °C -0.3 °C
December 1.3 °C -5.2 °C
Year 13.1 °C 3.4 °C
Weather Station Details
Years Station Coordinates
2002–2024 London CS location
1941–2002 London International Airport location
1932–1940 London Lambeth A location
1883–1931 London South location
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