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Ontario

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Ontario Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Ontario year round climate

  • Spring (March–May): Avg. -8.2–10.2°C, cold and changeable weather with frequent alternating snow and rain, gradually warming as the season progresses. Common activities: Maple viewing (late March to early April, weather permitting), spring outings (May). Recommended clothing: Warm coat, sweater, waterproof jacket, scarf, hat.
  • Summer (June–August): Avg. 15.3–17.6°C, warm and humid with higher rainfall. Common activities: Camping, boating, hiking. Recommended clothing: Light and breathable clothing, rain gear.
  • Autumn (September–November): Avg. 5.6–13.0°C, cool and pleasant with moderate rainfall, gradually cooling down with changing leaves. Common activities: Maple viewing, harvesting. Recommended clothing: Light jacket, long-sleeved clothing.
  • Winter (December–February): Avg. -16.5–-8.8°C, cold and dry with significant snowfall. Common activities: Skiing, ice fishing, snow activities. Recommended clothing: Heavy warm coat, warm hat, scarf, gloves, waterproof snow boots.

Ontario climatological average

Annual average temperature: approx. 2.3°C / Annual rainfall: approx. 581 mm / Summer humidity: 65%–75% / Rainiest month: July

Ontario monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-16.5°C
15.9
February
-15.3°C
25.6
March
-8.2°C
20.3
April
0°C
53
May
10.2°C
59
June
15.3°C
72
July
17.6°C
86.8
August
16.4°C
84.7
September
13°C
43.3
October
5.6°C
60
November
-2.2°C
39.7
December
-8.8°C
21.3

Ontario weather for the next seven days

5/7
Thursday
Patchy rain nearby
5.6°C/-4.1°C
5/8
Friday
Patchy rain nearby
6.5°C/-3.6°C
5/9
Saturday
Patchy rain nearby
5.2°C/-1.8°C
5/10
Sunday
Light snow showers
4.3°C/-2.6°C
5/11
Monday
Patchy rain nearby
8.1°C/-4.8°C
5/12
Tuesday
Patchy rain nearby
11.6°C/-2.7°C
5/13
Wednesday
Patchy rain nearby
5.7°C/3.9°C