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Montréal weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Montréal?
For a warm holiday, the best week has been 15–21 July (Weather Index 92). Favourable start dates for a 7-day trip run from 10 July to 30 July. July is warmest (26°C), September is driest and July has the most sun.
- Warmest
- July 26°C
- Coolest
- January -5°C
- Driest
- September 27% rain-day chance
- Wettest
- June 43% rain-day chance
- Sunniest
- July 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Montréal
Montréal historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | -5.5 | -13.3 | 36.5 | 11.3 | 78.2 | 5.5 |
| February | -3.4 | -12.9 | 38.2 | 10.7 | 79.3 | 6.7 |
| March | 2.2 | -6.4 | 38.7 | 12.0 | 86.3 | 8.2 |
| April | 9.9 | 0.4 | 42.0 | 12.6 | 120.5 | 8.9 |
| May | 18.4 | 7.5 | 37.1 | 11.5 | 86.8 | 10.7 |
| June | 23.0 | 12.8 | 43.0 | 12.9 | 120.5 | 11.4 |
| July | 25.7 | 16.0 | 41.6 | 12.9 | 112.0 | 12.2 |
| August | 24.3 | 14.6 | 41.6 | 12.9 | 126.4 | 11.2 |
| September | 20.4 | 10.3 | 27.0 | 8.1 | 69.7 | 9.8 |
| October | 13.4 | 4.8 | 38.4 | 11.9 | 133.6 | 7.3 |
| November | 4.3 | -2.8 | 42.0 | 12.6 | 90.9 | 5.7 |
| December | -2.4 | -9.4 | 38.4 | 11.9 | 89.6 | 5.0 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.