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.
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.