Average data for 10 years
1 September
Sunday
+23°
+17°
2 September
Monday
+22°
+17°
3 September
Tuesday
+22°
+16°
4 September
Wednesday
+20°
+17°
5 September
Thursday
+21°
+15°
6 September
Friday
+21°
+16°
7 September
Saturday
+20°
+16°
8 September
Sunday
+20°
+15°
9 September
Monday
+19°
+14°
10 September
today
+20°
+15°
11 September
tomorrow
+18°
+14°
12 September
Thursday
+18°
+14°
13 September
Friday
+19°
+12°
14 September
Saturday
+18°
+14°
15 September
Sunday
+15°
+13°
16 September
Monday
+17°
+10°
17 September
Tuesday
+18°
+12°
18 September
Wednesday
+18°
+12°
19 September
Thursday
+19°
+12°
20 September
Friday
+19°
+14°
21 September
Saturday
+18°
+14°
22 September
Sunday
+18°
+13°
23 September
Monday
+18°
+12°
24 September
Tuesday
+18°
+13°
25 September
Wednesday
+18°
+13°
26 September
Thursday
+20°
+14°
27 September
Friday
+18°
+14°
28 September
Saturday
+17°
+14°
29 September
Sunday
+14°
+10°
30 September
Monday
+14°
+10°
Cities near you
Canada
Montreal
United States
Colchester
United States
Burlington
United States
Montpelier
United States
Rochester
Cities with similar weather in September
Germany
Berlin
Austria
Vienna
Kazakhstan
Uralsk
Germany
Frankfurt am Main
Switzerland
Zurich
September in Ottawa is the sunniest month of the year. In September, the weather in Ottawa is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Ottawa has 15 sunny, 8 rainy, and 7 partly cloudy days in September. The rains are usually moderate.