Ottawa Weather: September
 |
Average Day Temperature: | 70.8°F |
|
Average Night Temperature: | 55.3°F |
|
Number of Sunny Days: | 12 days |
| Sunshine Hours: | 11.7 - 13.3 hours | |
|
Number of Rainy Days: | 3 days |
| Precipitation Totals: | 1.7 in | |
| detailed information | ||
14 day weather
forecast
forecast
| Ottawa |
Air Temperature in September, °F
The highest day temperature in September 2025 was 84°F. The lowest night temperature was 37°F. The average values for day and night temperatures during September were 73.6°F и 55.1°F respectivly.
Sunny, Cloudy and Gloomy days
You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Ottawa is 1.7 in. It makes september the least rainy month of the year.
Wind Speed in September, mph
The average wind speed in September is 6.9 mph. This value is relatively stable throughout the year.
Average Sunny Hours Per Day
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Ottawa in September is 7.5 hours.
Ottawa on the Weather Map
Canada Resorts:
NAME
F°
| Halifax |  |
+12 |
| Kingston |  |
+4 |
| Moncton | |
-6 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-4 |
| Prince Edward Island |  |
+6 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+28 |
| St. John's | |
+32 |
| Sydney | |
+24 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+12 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Ottawa
Local time: 01:10
05 dec, friday
| 0300 |  |
-6°F | N 2 mph |
| 0600 | |
-6°F | N 5 mph |
| 0900 |  |
2°F | N 6 mph |
| 1200 |  |
12°F | N 9 mph |
| 1500 | |
18°F | N 11 mph |
| 1800 | |
18°F | N 9 mph |
| 2100 | |
18°F | N 6 mph |
06 dec, saturday
| 0000 | |
18°F | NW 4 mph |