Weather in Ottawa: September
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Average day temperature: | 78.5°F |
| Average night temperature: | 59.1°F | |
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Number of sunny days: | 19 days |
| Day length: | 11.8 - 13.1 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.5 in. | |
| more information | ||
14 days
forecast
forecast
| Ottawa |
weather in
October
October
| Ottawa |
Air temperature in September, °F
Show year:
2025
2024
2023
The highest day temperature during September of 2025 was 92°F. At the same time the lowest night temperature was 39°F. Daily and nightly averages during September were 81.4°F and 55.8°F.
Sunny, partly cloudy and cloudy days
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Ottawa in September is 0.5 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 8.3 mph It makes September one of the least windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 9.2.
Best time for vacation in Ottawa
Ottawa on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Ottawa
Local time: 04:14
April 09, thursday
0600
55°F
NE
13 mph
13 mph
0900
59°F
E
11 mph
11 mph
1200
64°F
E
8 mph
8 mph
1500
73°F
NE
9 mph
9 mph
1800
64°F
E
3 mph
3 mph
2100
59°F
SW
6 mph
6 mph
April 10, friday
0000
54°F
W
6 mph
6 mph
0300
52°F
NE
7 mph
7 mph
