Monthly Historical AveragesSt. Thomas, ON
Average Temperature
High
26°
Feels 27
Low
16°
Feels 16
Average Precipitation
12 Days
88.1mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastFriday, August 7, 2026
Day
25°Feels 34
Wind
15 km/h S
Gust
23 km/h
Humidity
79%
P.O.P
100%
Rain
10-15 mm
Night
21°Feels 25
Wind
17 km/h S
Gust
26 km/h
Humidity
100%
P.O.P
40%
Rain
~1 mm
Historical AveragesAug 7
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity