Ontario Weather Year-Round — Best Time to Visit
Ontario, United States has warm weather year-round. The best time to visit is July (score: 100/100). Annual average high: 24.4°C, total rainfall: 403mm.
When is the best time to visit Ontario?
100
July is the best month to visit Ontario with a travel score of 100/100 (Excellent).
Expect highs of 32.3°C, 0 rain days, and 13.7 hours of daily sunshine.
View July weather details →Travel Score by Month
78
Jan
77
Feb
82
Mar
89
Apr
94
May
100
Jun
100
Jul
100
Aug
99
Sep
97
Oct
89
Nov
80
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Ontario each month?
24.4°C
Avg High
12.1°C
Avg Low
403mm
Annual Rain
How much rain does Ontario get?
Ontario receives 403mm of rain annually. The wettest month is typically February with 94mm, while July is the driest.
What is the weather like each month in Ontario?
January
78
18°C
Low: 7°C
6 rain days
Good
February
77
18°C
Low: 7°C
7 rain days
Good
March
82
20°C
Low: 8°C
6 rain days
Excellent
April
89
22°C
Low: 10°C
4 rain days
Excellent
May
94
25°C
Low: 12°C
2 rain days
Excellent
June
100
29°C
Low: 15°C
0 rain days
Excellent
July
Best time to visit100
32°C
Low: 18°C
0 rain days
Excellent
August
100
33°C
Low: 19°C
0 rain days
Excellent
September
99
31°C
Low: 18°C
1 rain days
Excellent
October
97
27°C
Low: 14°C
3 rain days
Excellent
November
89
22°C
Low: 10°C
3 rain days
Excellent
December
80
17°C
Low: 7°C
5 rain days
Good
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Data based on 1994–2024 averages · Last updated: 2024-12-31