When to go · Cornwall, Ontario
Cornwall, Ontario, month by month
The best months for Cornwall, Ontario: Jun, Jul, Aug, Sep. Months to avoid: Jan, Feb, Nov.
Month by month
- JanuaryAvoidListed as a month to avoid: Jan–Feb (cold, snow), Nov (grey and wet).-3.8 °C (25 °F) / -11.8 °C (11 °F), 14 rain days25 °F (-3.8 °C) / 11 °F (-11.8 °C), 14 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Jan–Feb (cold, snow), Nov (grey and wet).-2.1 °C (28 °F) / -10.6 °C (13 °F), 12 rain days28 °F (-2.1 °C) / 13 °F (-10.6 °C), 12 rain daysCrowds: Low
- MarchMixedOutside the best window (Jun–Sep). Across Canada: Late ski season; sugar shacks in Québec open for maple season.3.5 °C (38 °F) / -5.3 °C (22 °F), 12 rain days38 °F (3.5 °C) / 22 °F (-5.3 °C), 12 rain daysCrowds: Low
- AprilMixedOutside the best window (Jun–Sep). Across Canada: Thaw and mud; Rockies trails still snowy; Vancouver cherry blossoms.11.8 °C (53 °F) / 2 °C (36 °F), 12 rain days53 °F (11.8 °C) / 36 °F (2 °C), 12 rain daysCrowds: Low
- MayGoodOutside the best window (Jun–Sep). Across Canada: Victoria Day weekend opens the season; Rockies lakes still frozen at altitude.19.8 °C (68 °F) / 8.8 °C (48 °F), 13 rain days68 °F (19.8 °C) / 48 °F (8.8 °C), 13 rain daysCrowds: Medium
- JuneGreatInside Cornwall, Ontario's best window: Jun–Sep.24.6 °C (76 °F) / 14.1 °C (57 °F), 13 rain days76 °F (24.6 °C) / 57 °F (14.1 °C), 13 rain daysCrowds: Medium · 1 festival or holiday
- JulyGreatInside Cornwall, Ontario's best window: Jun–Sep.27.3 °C (81 °F) / 17 °C (63 °F), 12 rain days81 °F (27.3 °C) / 63 °F (17 °C), 12 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Cornwall, Ontario's best window: Jun–Sep.26.3 °C (79 °F) / 16.2 °C (61 °F), 11 rain days79 °F (26.3 °C) / 61 °F (16.2 °C), 11 rain daysCrowds: High
- SeptemberGreatInside Cornwall, Ontario's best window: Jun–Sep.22 °C (72 °F) / 11.8 °C (53 °F), 12 rain days72 °F (22 °C) / 53 °F (11.8 °C), 12 rain daysCrowds: Medium
- OctoberGoodOutside the best window (Jun–Sep). Across Canada: Foliage in Ontario, Québec and the Maritimes early in the month; mountain roads get snow.14.1 °C (57 °F) / 5.7 °C (42 °F), 13 rain days57 °F (14.1 °C) / 42 °F (5.7 °C), 13 rain daysCrowds: Medium
- NovemberAvoidListed as a month to avoid: Jan–Feb (cold, snow), Nov (grey and wet).6.9 °C (44 °F) / -0.3 °C (31 °F), 14 rain days44 °F (6.9 °C) / 31 °F (-0.3 °C), 14 rain daysCrowds: Low
- DecemberMixedOutside the best window (Jun–Sep). Across Canada: Christmas markets and ski openings; winter tyres required on many BC highways.0 °C (32 °F) / -6.7 °C (20 °F), 15 rain days32 °F (0 °C) / 20 °F (-6.7 °C), 15 rain daysCrowds: Medium · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Cornwall, Ontario, side by side.
Verdict
Jun: Great
Jul: Great
Daytime high
Jun: 24.6 °C (76 °F)76 °F (24.6 °C)
Jul: 27.3 °C (81 °F)81 °F (27.3 °C)
Night low
Jun: 14.1 °C (57 °F)57 °F (14.1 °C)
Jul: 17 °C (63 °F)63 °F (17 °C)
Rain days
Jun: 13
Jul: 12 (better)
Crowds
Jun: Medium
Jul: High
Prices
Jun: Medium
Jul: High
Festivals listed
Jun: 1
Jul: 1
June: Inside Cornwall, Ontario's best window: Jun–Sep.
July: Inside Cornwall, Ontario's best window: Jun–Sep.
Cornwall, Ontario: figures are long-term averages from this guide, not a forecast.