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Reviews of Ontario activities

Ontario Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Ontario year round climate

  • Spring (March–May): Avg. -46–50°F, 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. 59–63°F, warm and humid with higher rainfall. Common activities: Camping, boating, hiking. Recommended clothing: Light and breathable clothing, rain gear.
  • Autumn (September–November): Avg. 42–55°F, 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–-47.8°F, 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. 36.1°F / Annual rainfall: approx. 581 mm / Summer humidity: 65%–75% / Rainiest month: July

Ontario monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
2.3°F
15.9
February
4.5°F
25.6
March
17.2°F
20.3
April
32°F
53
May
50.4°F
59
June
59.5°F
72
July
63.7°F
86.8
August
61.5°F
84.7
September
55.4°F
43.3
October
42.1°F
60
November
28°F
39.7
December
16.2°F
21.3

Ontario weather for the next seven days

12/22
Monday
Overcast
9.9°F/-20.9°F
12/23
Tuesday
Overcast
26.2°F/12.7°F
12/24
Wednesday
Partly Cloudy
28°F/3.7°F
12/25
Thursday
Freezing fog
10.8°F/-6.6°F
12/26
Friday
Patchy moderate snow
-1.8°F/-21.1°F
12/27
Saturday
Light snow
24.7°F/-17.6°F
12/28
Sunday
Cloudy
14.5°F/-4.2°F