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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Mattawa, ON
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September
Average Temperature
High
20°
Feels 20
Low
9°
Feels 8
Average Precipitation
11 Days
Rain amount
77.9mm
Snow amount
0.1cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
22°
5
22°
6
23°
7
24°
8
20°
9
22°
10
17°
11
17°
12
20°
13
21°
14
21°
15
20°
16
19°
17
19°
18
18°
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Friday, September 4, 2026
Day
22°
Feels 24
Wind
13 km/h NW
Gust
24 km/h
Humidity
60%
P.O.P
30%
Night
13°
Feels 13
Wind
12 km/h N
Gust
21 km/h
Humidity
100%
P.O.P
20%
Historical Averages
Sep 4
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.