Toronto Weather in May
In May, Toronto averages a high of 19°C (66°F) and a low of 10°C (50°F), from 54 years of daily records (1971–2025).
19°C
Average high
66°F
10°C
Average low
50°F
33°C
Record high
91°F · May 17, 1977
-2°C
Record low
28°F · May 9, 2020
What May Is Like in Toronto
- The May heat record, 33°C (91°F) on May 17, 1977, has stood for 48 years.
- May in Toronto has become 0.9°C (1.6°F) warmer on average: the 2011–2025 average against 1970–1989.
- The warmest May in the record was 1998; the coldest was 1997.
At least 1 mm of rain falls on 28% of May days, and the month averages 69 mm in total.
Warmest: 1998 (22.3°C)Latest: 2024 (21.6°C)10-year averageLong-run average (18.6°C)
Look Up a Day in May
See the weather in Toronto on any May date, year by year.
Source: NOAA GHCN-Daily, Toronto (1971–2003); Toronto City (2002–2025). Averages cover 1971–2025. How we compute this