Montréal weather in May
In May, Montréal has an average high of 17 °C63 °F and an average low of 7 °C44 °F, with about 93 mm3.7 in of precipitation. It is the 5th warmest month of the year and ranks 7th for precipitation.
How May compares with other months
Compared with April, May is 7.8 °C14 °F warmer on average. Compared with June, May is 5.4 °C9.7 °F cooler on average and drier by 16 mm0.6 in. Daylight lasts about 14.9 hours around the middle of the month. Average relative humidity is 79% and the average cloud amount 66%.
Is May a good time to visit Montréal?
May is not among the most comfortable months by our comfort score: it is cool (average high 17 °C63 °F) and it is fairly wet (93 mm3.7 in). The most comfortable months in Montréal are June–September.
What to wear in May
For Montréal in May, pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
May in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Montréal | 1763 | 744 | 933.7 |
| Trois-Rivières | 1865 | 644 | 873.4 |
| Sherbrooke | 1864 | 643 | 1024.0 |
| Ottawa | 1966 | 745 | 853.4 |
| Québec | 1762 | 643 | 953.7 |
| Kingston | 1559 | 847 | 793.1 |
| Albany | 2170 | 949 | 1003.9 |
| Manchester | 1966 | 846 | 973.8 |
| Syracuse | 2069 | 948 | 953.8 |
Nearby places that are more than 1 °C1.8 °F warmer in May: Albany, Manchester and Syracuse.
Other months in Montréal
- January−7 °C19 °F / −18 °C0 °F
- February−5 °C23 °F / −16 °C3 °F
- March0 °C33 °F / −9 °C15 °F
- April9 °C49 °F / −1 °C31 °F
- May17 °C63 °F / 7 °C44 °F
- June22 °C72 °F / 13 °C55 °F
- July25 °C78 °F / 16 °C60 °F
- August25 °C77 °F / 15 °C59 °F
- September21 °C70 °F / 10 °C50 °F
- October12 °C54 °F / 3 °C38 °F
- November4 °C39 °F / −4 °C26 °F
- December−4 °C26 °F / −12 °C10 °F
Frequently asked questions
How warm is Montréal in May?
In May the average high in Montréal is 17 °C (63 °F) and the average low is 7 °C (44 °F).
Does it rain a lot in Montréal in May?
On average about 93 mm (3.7 in) of precipitation falls in May; it ranks 7th of the 12 months.
Is May the warmest month in Montréal?
No. The warmest month in Montréal is July, with an average high of 25 °C (78 °F). The coldest month is January, with an average low of -18 °C (0 °F).
How long is the day in Montréal in May?
In the middle of May the day in Montréal lasts about 14.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Montréal in May?
The average relative humidity in May is about 79%. This is a long-term average for the whole day.
How cloudy is Montréal in May?
On average about 66% of the sky is covered by cloud in May. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 38 m, while Montréal lies at about 216 m. Temperatures on this page were therefore adjusted by −1.2 °C2.1 °F using the standard lapse rate of 6.5 °C per 1,000 m.