Monthly Historical AveragesCastleton, ON
Average Temperature
High
18°
Feels 18
Low
8°
Feels 6
Average Precipitation
10 Days
74.3mm
0.1cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastSaturday, May 9, 2026
Day
14°Feels 13
Wind
19 km/h SE
Gust
29 km/h
Humidity
58%
P.O.P
40%
Rain
<1 mm
Night
5°Feels 1
Wind
20 km/h W
Gust
30 km/h
Humidity
93%
P.O.P
60%
Rain
2-4 mm
Historical AveragesMay 9
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity