Montréal weather in September
September is one of the best months to visit Montréal: highs of 22°C (72°F) and about 88 mm (3.5 in) of rain on average. Nights average 11°C (52°F) and cloud cover 54% (NASA POWER, 2001–2025 averages). It is the 5th driest month of the year and the 4th warmest. Compared with August, it is cooler and about as wet; October brings highs of 13°C (56°F) and 114 mm (4.5 in) of rain.
Is September a good time to visit Montréal?
best month Weather score 75/100.
Yes. September is one of the best months for weather in Montréal.
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Does it rain a lot in Montréal in September?
Some rain is normal: about 88 mm (3.5 in) falls in an average September. It is the 5th driest month of the year.
How warm is Montréal in September?
Days average 22°C (72°F) and nights 11°C (52°F).
Montréal weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | -6°C (21°F) | -16°C (2°F) | 72 mm | 69% | least pleasant |
| February | -4°C (25°F) | -15°C (5°F) | 68 mm | 68% | least pleasant |
| March | 2°C (35°F) | -8°C (17°F) | 76 mm | 65% | least pleasant |
| April | 11°C (51°F) | 0°C (33°F) | 95 mm | 67% | least pleasant |
| May | 19°C (65°F) | 8°C (46°F) | 93 mm | 66% | best |
| June | 23°C (74°F) | 14°C (57°F) | 109 mm | 62% | best |
| July | 27°C (80°F) | 17°C (62°F) | 95 mm | 58% | best |
| August | 26°C (79°F) | 16°C (61°F) | 98 mm | 57% | best |
| September | 22°C (72°F) | 11°C (52°F) | 88 mm | 54% | best |
| October | 13°C (56°F) | 4°C (40°F) | 114 mm | 68% | fair |
| November | 5°C (41°F) | -2°C (28°F) | 81 mm | 72% | least pleasant |
| December | -2°C (28°F) | -11°C (12°F) | 98 mm | 76% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
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