When to go · Cornwall, Ontario
Cornwall, Ontario in May
Good month. Outside the best window (Jun–Sep). Across Canada: Victoria Day weekend opens the season; Rockies lakes still frozen at altitude.
Key facts
- Verdict
- Good
- Temperature
- 20°C (68°F)68°F (20°C) / 9°C (48°F)48°F (9°C)
- average high / low
- Rain days
- 13
- Crowds
- Medium
- Canada overall
- Prices
- Medium
- Canada overall
Verdict
Outside the best window (Jun–Sep). Across Canada: Victoria Day weekend opens the season; Rockies lakes still frozen at altitude.
Is another month better than May?
May is rated good. These months rate higher:
Weather in May
- Cornwall, OntarioHighs around 19.8 °C (68 °F), lows around 8.8 °C (48 °F), rain on about 13 daysHighs around 68 °F (19.8 °C), lows around 48 °F (8.8 °C), rain on about 13 days
Crowds and prices
- Crowds · Canada overall
- Medium
- Prices · Canada overall
- Medium
Canada overall: Victoria Day weekend opens the season; Rockies lakes still frozen at altitude.
Compare two months
Weather, crowds and prices for any two months in Cornwall, Ontario, side by side.
Verdict
May: Good
Jun: Great (better)
Daytime high
May: 19.8 °C (68 °F)68 °F (19.8 °C)
Jun: 24.6 °C (76 °F)76 °F (24.6 °C)
Night low
May: 8.8 °C (48 °F)48 °F (8.8 °C)
Jun: 14.1 °C (57 °F)57 °F (14.1 °C)
Rain days
May: 13
Jun: 13
Crowds
May: Medium
Jun: Medium
Prices
May: Medium
Jun: Medium
Festivals listed
May: 0
Jun: 1
May: Outside the best window (Jun–Sep). Across Canada: Victoria Day weekend opens the season; Rockies lakes still frozen at altitude.
June: Inside Cornwall, Ontario's best window: Jun–Sep.
Cornwall, Ontario: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings
- A rain jacket or umbrella and shoes that dry fast