Monthly Historical AveragesSarnia, ON
Average Temperature
High
19°
Feels 19
Low
8°
Feels 7
Average Precipitation
7 Days
20.2mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastWednesday, May 13, 2026
Day
11°Feels 8
Wind
32 km/h W
Gust
48 km/h
Humidity
61%
P.O.P
30%
Rain
<1 mm
Night
7°Feels 3
Wind
27 km/h NW
Gust
41 km/h
Humidity
87%
P.O.P
40%
Rain
<1 mm
Historical AveragesMay 13
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity