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Ottawa Weather by Month
Average temperatures, rainfall and humidity for Ottawa, Canada, month by month, built from OpenWeather's historical records. Use it to see what a typical Ottawa month looks like before you travel — then check the live Ottawa forecast for the days ahead.
Warmest month
July
27°C average high
Coolest month
January
-13°C average low
Wettest month
August
55 mm of rain
Driest month
February
10 mm of rain
Average temperature and rainfall in Ottawa by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | -4°C | -13°C | -31°C / 11°C | 15 mm | 78% | 12 km/h |
| February | -3°C | -13°C | -38°C / 15°C | 10 mm | 74% | 13 km/h |
| March | 3°C | -6°C | -28°C / 19°C | 28 mm | 70% | 14 km/h |
| April | 11°C | 1°C | -12°C / 29°C | 54 mm | 65% | 14 km/h |
| May | 20°C | 9°C | -3°C / 34°C | 53 mm | 64% | 12 km/h |
| June | 24°C | 14°C | 3°C / 36°C | 55 mm | 70% | 10 km/h |
| July | 27°C | 17°C | 9°C / 35°C | 43 mm | 72% | 10 km/h |
| August | 26°C | 16°C | 7°C / 36°C | 55 mm | 75% | 9 km/h |
| September | 22°C | 12°C | -1°C / 33°C | 39 mm | 77% | 10 km/h |
| October | 14°C | 6°C | -8°C / 31°C | 51 mm | 77% | 10 km/h |
| November | 6°C | -2°C | -21°C / 23°C | 32 mm | 77% | 12 km/h |
| December | -1°C | -8°C | -29°C / 16°C | 27 mm | 80% | 12 km/h |
Best time to visit Ottawa
The most comfortable time to visit Ottawa is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 462 mm a year.
Travellers who prefer heat should aim for July, when highs average 27°C. August is the month to avoid if rain would spoil your plans — it averages 55 mm, roughly 6× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Ottawa forecast for what is happening now.