Average data for 10 years
1 September
Monday
+27°
+17°
2 September
Tuesday
+27°
+17°
3 September
Wednesday
+28°
+17°
4 September
Thursday
+27°
+17°
5 September
Friday
+27°
+16°
6 September
Saturday
+27°
+17°
7 September
Sunday
+26°
+17°
8 September
Monday
+24°
+16°
9 September
Tuesday
+24°
+15°
10 September
Wednesday
+25°
+15°
11 September
Thursday
+26°
+15°
12 September
Friday
+25°
+15°
13 September
Saturday
+25°
+15°
14 September
Sunday
+24°
+14°
15 September
Monday
+24°
+14°
16 September
Tuesday
+24°
+14°
17 September
Wednesday
+25°
+14°
18 September
Thursday
+25°
+14°
19 September
Friday
+25°
+15°
20 September
Saturday
+25°
+15°
21 September
Sunday
+24°
+15°
22 September
Monday
+23°
+13°
23 September
Tuesday
+23°
+13°
24 September
Wednesday
+23°
+13°
25 September
Thursday
+23°
+13°
26 September
Friday
+23°
+13°
27 September
Saturday
+22°
+13°
28 September
Sunday
+21°
+12°
29 September
Monday
+21°
+11°
30 September
Tuesday
+22°
+12°
In September, the weather in Ottawa is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, Ottawa has 13 sunny, 8 rainy, 7 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Ottawa.