Climate averages 1991–2020
Montréal weather
in May.
A mild, wet month: the 5th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Montréal: daytime highs average 17.3°C and nights cool to about 7.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 100 mm of rain on roughly 12 days, which makes May a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 52 min on an average May day.
The nearest other city in this atlas is Villeray–Saint-Michel–Parc-Extension (6 km away). In May its highs average 18.3°C, 1.0°C warmer than Montréal, with 100 mm of rain.
Among the 86 cities listed in Canada, Montréal ranks joint 42nd of 86 for the warmest May highs and joint 71st of 86 for the driest May (rainfall, lowest first). The mean May high of those 86 cities is 17.0°C; Montréal is 0.3°C warmer than that mean.
From May to June, average highs rise by 4.9°C to 22.1°C, and monthly rainfall rises from 100 mm to 108 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Montréal climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -6.4°C-15.3°C | -15.3°C | 74 | 10.5 | 9.19 h |
| February | -4.7°C-14.0°C | -14.0°C | 60 | 9.3 | 10.310 h |
| March | 1.3°C-8.0°C | -8.0°C | 74 | 10.3 | 11.912 h |
| April | 9.5°C-0.4°C | -0.4°C | 103 | 11.7 | 13.513 h |
| May, selected | 17.3°C7.1°C | 7.1°C | 100 | 11.9 | 14.915 h |
| June | 22.1°C13.2°C | 13.2°C | 108 | 12.2 | 15.616 h |
| July | 24.5°C16.2°C | 16.2°C | 101 | 12.8 | 15.315 h |
| August | 23.5°C15.4°C | 15.4°C | 102 | 11.6 | 14.114 h |
| September | 19.3°C11.3°C | 11.3°C | 99 | 10.2 | 12.613 h |
| October | 11.8°C4.9°C | 4.9°C | 112 | 11.5 | 11.011 h |
| November | 4.4°C-1.8°C | -1.8°C | 88 | 11.9 | 9.610 h |
| December | -2.5°C-9.6°C | -9.6°C | 85 | 11.7 | 8.89 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Villeray–Saint-Michel–Parc-Extension in MayCanada · 6 kmHigh 18.3°C · Low 7.8°C · 100 mm rain
- Mercier–Hochelaga-Maisonneuve in MayCanada · 8 kmHigh 18.5°C · Low 8.3°C · 100 mm rain
- Longueuil in MayCanada · 9 kmHigh 18.5°C · Low 8.3°C · 100 mm rain
- Laval in MayCanada · 11 kmHigh 18.4°C · Low 8.1°C · 93 mm rain
- Pierrefonds-Roxboro in MayCanada · 20 kmHigh 18.3°C · Low 8.3°C · 93 mm rain
- Terrebonne in MayCanada · 22 kmHigh 18.4°C · Low 8.3°C · 95 mm rain
- Saint-Louis-de-Terrebonne in MayCanada · 26 kmHigh 18.1°C · Low 7.9°C · 95 mm rain
- Repentigny in MayCanada · 28 kmHigh 18.4°C · Low 8.2°C · 93 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Montréal) is explained once on the Montréal year overview and on the Sources, method and limits page.
Longueuil, Villeray–Saint-Michel–Parc-Extension and Mercier–Hochelaga-Maisonneuve lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.