Ontario Weather in May

With daytime temperatures of 26°C (79°F) and nighttime lows of 12°C (54°F), May in Ontario brings high temperatures during the day. The excellent weather makes it an appealing time to visit.

Rainfall in Ontario in May

Typically, about 2 days will experience rainfall, with an average of 7.1 mm (0.3 in) for the month. When rain does fall, showers tend to be light and brief. Most days will be dry.

Temperature in Ontario in May

May in Ontario is generally excellent, with days reaching 26°C (79°F) and nights settling around 12°C (54°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 12°C (54°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Ontario in May

There are approximately 311 hours of sunshine this month, resulting in mostly clear days.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, October and November typically offer the best weather for Ontario.