Ottawa Weather: September
 |
Average Day Temperature: | 81.6°F |
|
Average Night Temperature: | 60.2°F |
|
Number of Sunny Days: | 19 days |
| Sunshine Hours: | 11.8 - 13.1 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.5 in | |
| detailed information | ||
14 day weather
forecast
forecast
| Ottawa |
Air Temperature in September, °F
The highest day temperature in September 2025 was 97°F. The lowest night temperature was 38°F. The average values for day and night temperatures during September were 84.9°F и 56.4°F respectivly.
Sunny, Cloudy and Gloomy days
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Ottawa is 0.5 in. It makes september one of the least rainy months of the year.
Wind Speed in September, mph
The average wind speed in September is 8.3 mph. It makes September one of the most windless months of the year for Ottawa.
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 9.1 hours.
Ottawa on the Weather Map
USA Resorts:
NAME
F°
| Boston |  |
+94 |
| Chicago | |
+88 |
| Hawaii |  |
+80 |
| Houston |  |
+90 |
| Las Vegas | |
+120 |
| Los Angeles | |
+106 |
| Maui |  |
+76 |
| Miami | |
+100 |
| Myrtle Beach | |
+96 |
| New York | |
+114 |
| San Diego | |
+96 |
| San Francisco | |
+76 |
| Santa Monica | |
+84 |
| Sarasota | |
+102 |
| Tampa | |
+100 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Ottawa
Local time: 13:14
15 jul, wednesday
| 1500 |  |
104°F | SE 3 mph |
| 1800 | |
100°F | E 3 mph |
| 2100 |  |
88°F | SE 2 mph |
16 jul, thursday
| 0000 | |
82°F | S 2 mph |
| 0300 | |
76°F | SW 3 mph |
| 0600 |  |
74°F | SW 3 mph |
| 0900 | |
82°F | SW 2 mph |
| 1200 | |
88°F | W 5 mph |