Montreal weather in May
May in Montreal: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Montreal · #267 of 604 destinations to visit in May · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Montreal climate normals — May
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 7°C / 45°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 77 mm / 3 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 62% | 💧 humid |
| Dew point | 5°C / 41°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 14.9 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Montreal in May — FAQ
- Is May a good time to visit Montreal?
- May in Montreal: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Montreal on SeasonMap's comfort score (83/100).
- What is the weather like in Montreal in May?
- In May, Montreal averages a daily high of 18°C and a low of 7.3°C, with about 76.5 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Montreal in May?
- Montreal has a mean US Air Quality Index of about 47 in May.