Montreal Climate — Average Highs, Lows & Rainfall by Month
Montreal has a temperate climate with four distinct seasons. Daytime temperatures average 26°C / 80°F in July, the warmest month, and drop to -5°C / 24°F in January, the coldest. Overnight lows in January average -12°C / 10°F. Montreal receives about 1127 mm of rain a year across roughly 143 wet days, with August the wettest month.
Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05
Monthly averages in Montreal
Average daytime high, overnight low and rainfall for each month of the year.
| Month | Avg high | Avg low | Rainfall | Wet days |
|---|---|---|---|---|
| January | -5°C / 24°F | -12°C / 10°F | 68 mm | 12 |
| February | -3°C / 27°F | -12°C / 10°F | 71 mm | 12 |
| March | 4°C / 40°F | -5°C / 23°F | 77 mm | 12 |
| April | 12°C / 54°F | 2°C / 35°F | 118 mm | 12 |
| May | 20°C / 67°F | 9°C / 49°F | 78 mm | 11 |
| June | 25°C / 76°F | 15°C / 60°F | 124 mm | 14 |
| July | 26°C / 80°F | 18°C / 65°F | 118 mm | 12 |
| August | 26°C / 78°F | 17°C / 63°F | 130 mm | 13 |
| September | 22°C / 71°F | 13°C / 56°F | 70 mm | 8 |
| October | 16°C / 60°F | 8°C / 46°F | 101 mm | 11 |
| November | 6°C / 43°F | 0°C / 32°F | 79 mm | 12 |
| December | -1°C / 31°F | -7°C / 19°F | 96 mm | 14 |
Best time to visit Montreal
September, May, July offer the most comfortable weather in Montreal: mild daytime temperatures with the year's lowest rainfall — September averages 22°C (71°F); May averages 20°C (67°F); July averages 26°C (80°F).
Montreal climate FAQ
- What is the hottest month in Montreal?
- July is the hottest month in Montreal, with average daytime highs of 26°C / 80°F and overnight lows of 18°C / 65°F (averages for 2021–2025).
- What is the coldest month in Montreal?
- January is the coldest month in Montreal, with average highs of -5°C / 24°F and lows of -12°C / 10°F.
- How much rain does Montreal get a year?
- Montreal receives about 1127 mm of rainfall a year, spread over roughly 143 wet days. August is the wettest month (130 mm on average) and January the driest (68 mm).
- When is the best time to visit Montreal?
- September, May, July are the most comfortable months in Montreal: mild daytime temperatures with the least rainfall of the year.
Want today's conditions instead of averages?
See live weather in Montreal →Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Montreal weather page.