September
Best time
21.2°C / 13°C
14 rain days
mild, rainy
- comfortable temperatures (avg high 21.2°C / 70°F)
Best time to visit Montreal
Montreal, Canada — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: September.
Best months to visit
OK — shoulder months
May
OK
19.3°C / 8.5°C
16 rain days
mild, very wet
- comfortable temperatures (avg high 19.3°C / 67°F)
October
OK
13.8°C / 6.7°C
18 rain days
cool, very wet
April
OK
10.7°C / 0.7°C
17 rain days
cool, very wet
November
OK
5.5°C / -1.1°C
17 rain days
chilly, freezing nights, very wet
Months to skip
June
Skip
23.6°C / 14.4°C
19 rain days
warm, very wet
- extremely wet (19 rain days)
July
Skip
26.2°C / 17.7°C
20 rain days
warm, very wet
- extremely wet (20 rain days)
August
Skip
25°C / 17°C
20 rain days
warm, very wet
- extremely wet (20 rain days)
March
Skip
2.3°C / -6.8°C
18 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -6.8°C)
- extremely wet (18 rain days)
December
Skip
-0.3°C / -7.1°C
16 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -7.1°C)
- heavy rain expected (16 days)
February
Skip
-3.3°C / -12.6°C
17 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -12.6°C)
- heavy rain expected (17 days)
January
Skip
-4.8°C / -13.5°C
17 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -13.5°C)
- heavy rain expected (17 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.