Ottawa in september: average Weather, Temperature and Climate
Weather in Ottawa in september 2025
The weather in Ottawa in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
56°F
Clear/Sunny
39% of time
22%
13%
13%
Weather at 12pm
68°F
Clear/Sunny
43% of time
24%
15%
11%
Weather at 6pm
61°F
Clear/Sunny
45% of time
21%
18%
9%
Weather at 3am
54°F
31%
30%
17%
10%
Evolution of daily average temperature and precipitation in Ottawa in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Ottawa in september.
The climate of Ottawa in september is good
In september in Ottawa, the climate is rather dry (with 4.6in of rainfall over 6 days). This is better than the previous month since in august it receives an average of 5.7in of precipitation over 9 days.
The climate comfortable in that locality september. The high seasonal norm is 70°F. In the morning the temperature drops to 56°F. Thus, the mean temperature average on this month of september in Ottawa is 63°F. Note that seasonal normals in contrast with those observed in Ottawa in the month of september with a maximum record of 90°F in 2017 and a minimum record of 38°F in 2014. You can hope to have about 21 days with temperatures up to 65°F, or 70% of time.
On this month of september, day length in Ottawa is generally 12:31. The sun rises at 05:42 and sunset is at 18:13.
With a good weather, this month is recommended to go in this city in Canada.
Seasonal average climate and temperature of Ottawa in september
Check below seasonal norms These datas are compiled from the weather statements of the past years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 63°F | ||||
| Highest temperature | 70°F | ||||
| Lowest temperature | 56°F | ||||
| Highest record temperature | 90°F (2017) | ||||
| Lowest record temperature | 38°F (2014) | ||||
| Number of days at +86°F | 0 day(s) (0%) | ||||
| Number of days at +65°F | 21 day(s) (70%) | ||||
| Number of days at -32°F | 0 day(s) (0%) | ||||
| Wind | |||||
| Wind speed | 15km/h | ||||
| Wind temperature | 54°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 4.6in | ||||
| Number of days with rainfall | 6 day(s) (21%) | ||||
| Record daily rainfall | 2.3in (2010) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 89% | ||||
| Visibility | 8.68km | ||||
| Cloud cover | 36% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:42 | ||||
| Time of sunset | 18:13 | ||||
| Length of day | 12:31 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Ottawa in september 2024:
54°F to 68°F
47°F to 63°F
43°F to 68°F
50°F to 76°F
52°F to 77°F
50°F to 74°F
50°F to 59°F
43°F to 49°F
40°F to 65°F
41°F to 65°F
47°F to 76°F
56°F to 79°F
56°F to 81°F
58°F to 79°F
59°F to 79°F
59°F to 83°F
59°F to 81°F
59°F to 81°F
58°F to 77°F
63°F to 79°F
58°F to 67°F
58°F to 70°F
58°F to 61°F
58°F to 68°F
52°F to 59°F
59°F to 67°F
54°F to 68°F
56°F to 67°F
54°F to 67°F
56°F to 68°F
Map: other cities in Canada in september
Cities near Ottawa:
| Kingston in september | good weather |
| Orillia in september | good weather |
| North Bay in september | good weather |
| Toronto in september | good weather |
| Quebec City in september | good weather |
| Brampton in september | good weather |
| Niagara Falls (Ontario) in september | good weather |
| Owen Sound in september | good weather |
| Greater Sudbury in september | good weather |
| Bruce Peninsula in september | good weather |
| Timmins in september | tolerable weather |
| Sault Ste. Marie in september | good weather |
Click over cities on the map for information about the weather in september.
Ottawa
perfect weather
good
tolerable
bad
very bad
Weather data for Ottawa in september:
Weather data for Ottawa for september are derived from an average of the weather forecast since 2009 in Ottawa. There is a margin of error and these forecasts are to be considered as general information only. The weather in Ottawa can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Ottawa.