September
OK
21.2°C / 12.6°C
15 rain days
mild, rainy
- comfortable temperatures (avg high 21.2°C / 70°F)
Best time to visit Ottawa
Ottawa, Canada — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. Every month has trade-offs — pick what you can tolerate.
Best · September & May
About Ottawa
Ottawa is the capital city of Canada. It is located in the southeastern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Quebec, and forms the core of the Ottawa–Gatineau census metropolitan area (CMA) and the National Capital Region (NCR).
— condensed from Wikipedia
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OK — shoulder months
May
OK
19.3°C / 7.7°C
16 rain days
mild, very wet
- comfortable temperatures (avg high 19.3°C / 67°F)
June
OK
23.5°C / 13.3°C
18 rain days
warm, very wet
- comfortable temperatures (avg high 23.5°C / 74°F)
July
OK
26.3°C / 16.7°C
18 rain days
warm, very wet
- comfortable temperatures (avg high 26.3°C / 79°F)
- warm evenings without humidity overload
August
OK
24.9°C / 16.4°C
18 rain days
warm, very wet
- comfortable temperatures (avg high 24.9°C / 77°F)
- warm evenings without humidity overload
October
OK
13.7°C / 6.4°C
18 rain days
cool, very wet
April
OK
10.8°C / 0.2°C
17 rain days
cool, very wet
November
OK
5.4°C / -1.2°C
17 rain days
chilly, freezing nights, very wet
Months to skip
March
Skip
2.3°C / -7.5°C
18 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -7.5°C)
- extremely wet (18 rain days)
December
Skip
-0.1°C / -6.7°C
17 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -6.7°C)
- heavy rain expected (17 days)
February
Skip
-3.1°C / -12.9°C
17 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -12.9°C)
- heavy rain expected (17 days)
January
Skip
-4.3°C / -13.9°C
18 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -13.9°C)
- extremely wet (18 rain days)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.