Montreal Weather in May
In May, Montreal averages a high of 19°C (66°F) and a low of 10°C (49°F), from 54 years of daily records (1971–2026).
19°C
Average high
66°F
10°C
Average low
49°F
36°C
Record high
97°F · May 27, 2020
-3°C
Record low
26°F · May 7, 1995
What May Is Like in Montreal
- The coldest May reading, -3°C (26°F) on May 7, 1995, has not been matched in 31 years.
- The warmest May in the record was 1998; the coldest was 1974.
At least 1 mm of rain falls on 34% of May days, and the month averages 85 mm in total.
Warmest: 1998 (23.1°C)Latest: 2026 (18.0°C)10-year averageLong-run average (19.1°C)
Look Up a Day in May
See the weather in Montreal on any May date, year by year.
Source: NOAA GHCN-Daily, Mctavish (1994–2026); Montreal Mcgill (1971–1993); Montreal/St-Hubert A (1979–2009). Averages cover 1971–2026. How we compute this