Sarnia Weather Year-Round — Best Time to Visit
Sarnia, Canada has cool weather year-round. The best time to visit is August (score: 83/100). Annual average high: 13.1°C, total rainfall: 825mm.
When is the best time to visit Sarnia?
83
August is the best month to visit Sarnia with a travel score of 83/100 (Excellent).
Expect highs of 25.4°C, 10 rain days, and 11.3 hours of daily sunshine.
View August weather details →Travel Score by Month
37
Jan
43
Feb
52
Mar
62
Apr
72
May
82
Jun
83
Jul
83
Aug
81
Sep
64
Oct
54
Nov
42
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Sarnia each month?
13.1°C
Avg High
5.8°C
Avg Low
825mm
Annual Rain
How much rain does Sarnia get?
Sarnia receives 825mm of rain annually. The wettest month is typically June with 89mm, while February is the driest.
What is the weather like each month in Sarnia?
January
37
-1°C
Low: -8°C
9 rain days
Poor
February
43
0°C
Low: -8°C
8 rain days
Mixed
March
52
5°C
Low: -3°C
9 rain days
Mixed
April
62
12°C
Low: 3°C
11 rain days
Good
May
72
18°C
Low: 10°C
11 rain days
Good
June
82
24°C
Low: 16°C
11 rain days
Excellent
July
83
26°C
Low: 19°C
10 rain days
Excellent
August
Best time to visit83
25°C
Low: 18°C
10 rain days
Excellent
September
81
22°C
Low: 15°C
9 rain days
Excellent
October
64
15°C
Low: 9°C
11 rain days
Good
November
54
8°C
Low: 2°C
9 rain days
Mixed
December
42
2°C
Low: -3°C
9 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31