Oshawa Average Temperature by Month

This page shows the average temperature in each month of the year in Oshawa, Ontario. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Oshawa?
In Oshawa, Ontario, the warmest month is July, with an average daily high temperature of 25.8 °C and an average low of 15.9 °C.
What's the Coldest Month in Oshawa?
In Oshawa, Ontario, the coolest month is January, with an average daily high temperature of -1.0 °C and an average low of -8.8 °C.
Month Avg. High Avg. Low
January -1.0 °C -8.8 °C
February -0.2 °C -8.3 °C
March 4.3 °C -4.0 °C
April 10.6 °C 1.6 °C
May 17.5 °C 7.5 °C
June 22.7 °C 13.0 °C
July 25.8 °C 15.9 °C
August 24.9 °C 15.4 °C
September 21.0 °C 11.4 °C
October 13.8 °C 5.3 °C
November 7.6 °C 0.2 °C
December 2.1 °C -4.7 °C
Year 12.5 °C 3.8 °C
Weather Station Details
Years Station Coordinates
2010–2024 Oshawa location
1970–2009 Oshawa WPCP location
1882–1969 Oshawa location
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