Monthly Historical AveragesSarnia, ON
Average Temperature
High
27°
Feels 28
Low
17°
Feels 17
Average Precipitation
11 Days
43.1mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastSaturday, July 4, 2026
Day
27°Feels 35
Wind
21 km/h W
Gust
32 km/h
Humidity
66%
P.O.P
70%
Rain
1-3 mm
Night
20°Feels 22
Wind
18 km/h N
Gust
29 km/h
Humidity
100%
P.O.P
60%
Rain
~1 mm
Historical AveragesJul 4
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity