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Ottawa weather in September 2025
Expect 68°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Ottawa in September. Check more long-term weather averages for Ottawa in September before you book your next holiday to Ontario in 2025/2026.
- 6868°F max day temperature
- 6 hours of sunshine per day
- 1212 days with some rainfall
- 4848°F min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 3.13.1 inches of monthly rainfall
- 55 (Moderate) UV index
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Recommended for Ontario
The September weather guide for Ontario (Ottawa) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about Canada
How hot is it in Ottawa in September?
Daytime temperatures usually reach 68°F in Ottawa in September, falling to 48°F at night.
How sunny is it in Ottawa in September?
There are normally 6 hours of bright sunshine each day in Ottawa in September - that's 46% of daylight hours.
Does it rain in Ottawa in September?
There are usually 12 days with some rain in Ottawa in September and the average monthly rainfall is 3.1 inches.
Ottawa September sunrise & sunset times
Browse the sunrise and sunset times for Ottawa in September 2025. Select a month to view Ottawa sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:25 | 18:40 |
Monday, 15th September 2025 | 05:42 | 18:13 |
Tuesday, 30th September 2025 | 06:00 | 17:44 |
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