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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Chalk River, ON
Content continues below
September
Average Temperature
High
20°
Feels 20
Low
8°
Feels 8
Average Precipitation
10 Days
Rain amount
70.3mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
23°
3
24°
4
23°
5
23°
6
24°
7
25°
8
22°
9
25°
10
21°
11
20°
12
19°
13
21°
14
22°
15
22°
16
21°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Wednesday, September 2, 2026
Day
23°
Feels 29
Wind
14 km/h SE
Gust
30 km/h
Humidity
83%
P.O.P
90%
Rain
~10 mm
Night
16°
Feels 16
Wind
8 km/h W
Gust
13 km/h
Humidity
100%
P.O.P
70%
Rain
<1 mm
Historical Averages
Sep 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.