Highest Daily Low Temperatures in London History

This is a list of the hottest daily low temperatures ever recorded in London, Ontario history from 1883–2024 based on data from the NOAA.

Highest temperatures all-time

Record for the highest daily low temperature in London

The highest low temperature for a calendar day in London, Ontario history was 25.6 °C which has happened 3 times, most recently on Tuesday August 1, 2006.

Rank	Temperature	Date
1	25.6 °C	August 1, 2006
1	25.6 °C	August 12, 1944
1	25.6 °C	August 7, 1918
4	25.0 °C	July 4, 1999
4	25.0 °C	June 29, 1959
4	25.0 °C	July 6, 1902
7	24.6 °C	July 21, 2011
8	24.4 °C	July 5, 1999
8	24.4 °C	July 27, 1955
8	24.4 °C	June 26, 1952
8	24.4 °C	July 18, 1942
8	24.4 °C	July 14, 1936
13	23.9 °C	July 1, 1931
13	23.9 °C	August 4, 1930
13	23.9 °C	July 30, 1917
13	23.9 °C	July 6, 1900
13	23.9 °C	July 5, 1897
13	23.9 °C	July 2, 1897
13	23.9 °C	August 9, 1896
13	23.9 °C	August 9, 1892