World Resorts Canada Ottawa Weather

Ottawa weather in September

Weather in Ottawa: September

Average day temperature: 68.5°F
Average night temperature: 54.8°F
Number of sunny days: 12 days
Day length: 11.7 - 13.3 hours
Number of rainy days: 4 days
Precipitation totals: 1.8 in.

Air temperature in September, °F

Show year:
2024
2023
2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
0
14
28
42
56
70
84
98
112
Day temperature   
Night temperature

The highest day temperature during September of 2024 was 84°F. At the same time the lowest night temperature was 41°F. Day and night temperature averages during September were 69.9°F and 55.2°F.

Sunny, partly cloudy and cloudy days
Sunny days
Partly cloudy days
Cloudy days
37%
33%
30%

Number of sunny, partly cloudy and cloudy days in September is almost equal.

Precipitation total in September, in.

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
2.2
2.1
3.0
3.4
2.7
3.2
3.1
3.9
2.9
2.9
2.7
2.2
2.1
3.0
1.8
3.4
2.7
3.2
3.1
3.9
2.9
2.9
2.7

Precipitation total value in Ottawa in September is 1.8 in. Other months of the year show relatively similar values.

Wind speed in September, mph
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
1.5
3.1
4.6
6.1
7.6
9.2
10.7
8.0
8.2
7.5
6.5
6.7
7.5
7.7
8.9
8.8
8.4
7.8
8.0
8.2
7.5
6.6
6.5
6.7
7.5
7.7
8.9
8.8
8.4
7.8

The average wind speed value in September is 6.6 mph It makes September one of the least windy months of the year.

Average sunny hours
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
1.5
3.0
4.4
5.9
7.4
8.9
10.4
2.9
4.3
4.8
7.6
8.6
8.1
8.5
5.6
4.5
3.4
3.3
2.9
4.3
4.8
6.7
7.6
8.6
8.1
8.5
5.6
4.5
3.4
3.3

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: 6.7.

Best time for vacation in Ottawa

Sunniest months:
July 14 days
August 14 days
September 12 days
Warmest months:
July 78.2 °F
August 76.2 °F
June 71.5 °F
Coldest months:
January 19.1 °F
February 21.5 °F
December 27.3 °F
Rainiest months:
June 6 days
April 6 days
August 5 days
Windiest months:
April 9.8 mph
March 9.0 mph
February 8.8 mph

Ottawa on a weather map

Leaflet | Tiles © Esri
Places in Canada:
Name
°F
+32°F
+36°F
-13°F
+16°F
+7°F
+7°F
+12°F
+30°F
+34°F
+10°F
+12°F
+10°F
+32°F
24 Hours Forecast
Ottawa
Local time: 01:43
February 13, thursday
0300
10°F
W
19 mph
0600
14°F
W
16 mph
0900
18°F
W
15 mph
1200
23°F
W
11 mph
1500
28°F
NE
8 mph
1800
25°F
E
19 mph
2100
19°F
E
19 mph
February 14, friday
0000
16°F
E
15 mph
Units of measurement: °C / °F