Highest Temperatures in London History

This is a list of the 20 highest temperatures ever recorded in London, Ontario history from 1883–2024 based on data from the NOAA.

• Highest temperatures by year
• Lowest temperatures all-time
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Rank	Temperature	Date
1	41.1 °C	August 6, 1918
2	39.4 °C	August 7, 1918
3	38.9 °C	July 9, 1936
3	38.9 °C	July 8, 1936
3	38.9 °C	July 4, 1911
3	38.9 °C	July 3, 1911
7	38.3 °C	July 13, 1936
7	38.3 °C	July 11, 1936
7	38.3 °C	July 10, 1936
10	38.2 °C	June 25, 1988
11	37.8 °C	July 12, 1936
11	37.8 °C	July 4, 1921
11	37.8 °C	July 30, 1916
11	37.8 °C	July 5, 1911
15	37.2 °C	July 1, 1931
15	37.2 °C	June 6, 1925
15	37.2 °C	August 13, 1918
15	37.2 °C	August 5, 1918
15	37.2 °C	August 21, 1916
20	37.0 °C	August 8, 2001