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Ottawa’s Historical Weather Data for September: Records and Averages

While temperatures spike this weekend in the Capital, here’s a look at the region’s average temperatures and historically hottest and driest days for September. All historical weather data is collected from The Weather Network.

September – Average Highs and Lows  (°C)

Ottawa’s Average High: 19.7 

Average Low: 9.7

Temperature Average: 14.7 

September – Daily Record Highs and Lows  (°C)

Day Record High: 36.7
on September 11th 1931 

Day Record Low: -4.4
on September 28th 1947

Single Day Record Rainfall: 99 mm
on September 9th 1942


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