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July is the hottest month in Ottawa, with an average high of 27°C / 80°F; January is the coldest (-5°C / 23°F). August is the wettest month, averaging 89 mm / 3.5 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | -5 / 23 | -14 / 7 | 52 / 2.0 | 9 |
| Feb | -3 / 26 | -13 / 8 | 51 / 2.0 | 9 |
| Mar | 3 / 37 | -7 / 19 | 59 / 2.3 | 8 |
| Apr | 11 / 52 | 1 / 34 | 76 / 3.0 | 9 |
| May | 19 / 67 | 8 / 46 | 76 / 3.0 | 9 |
| Jun | 24 / 75 | 13 / 56 | 85 / 3.3 | 10 |
| Jul | 27 / 80 | 16 / 60 | 83 / 3.3 | 8 |
| Aug | 26 / 78 | 15 / 58 | 89 / 3.5 | 8 |
| Sep | 22 / 71 | 10 / 50 | 79 / 3.1 | 8 |
| Oct | 13 / 56 | 4 / 39 | 83 / 3.3 | 10 |
| Nov | 6 / 43 | -2 / 28 | 59 / 2.3 | 9 |
| Dec | -2 / 29 | -9 / 16 | 71 / 2.8 | 11 |
Extremes since 2000: highest 37°C / 99°F (August 9, 2001), lowest -32°C / -26°F (February 4, 2023).
Daylight lasts about 15.5 hours in June and 8.5 hours in December.
Data: Meteostat — Ottawa CDA RCS, 1991–2020 averages.
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