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Ottawa weather in August 2026
Expect daytime maximum temperatures of 77°F in Ottawa, Ontario in August based on long-term weather averages. There are 8 hours of sunshine per day on average with 11 days with some rainfall and typically 3.4 inches of rainfall in the month.
- 77°F max day temperature
77 - 8 hours of sunshine per day
- 11 days with some rainfall
11 - 57°F min night temperature
57 - 14 hours of daylight per day
14 - No heat & humidity
0 - 3.4 inches of monthly rainfall
3.4 - 7 (High) UV index
7
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Recommended for Ontario
The August 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 Ontario
How hot is it in Ottawa in August?
Daytime temperatures usually reach 77°F in Ottawa in August with low heat and humidity, falling to 59°F at night.
How sunny is it in Ottawa in August?
There are normally 8 hours of bright sunshine each day in Ottawa in August - that's 56% of daylight hours.
How warm is the sea around Ottawa in August?
The average sea temperature around Ottawa in August is 70°F.
Does it rain in Ottawa in August?
There are usually 10 days with some rain in Ottawa in August and the average monthly rainfall is 3.3 inches.
Ottawa August sunrise & sunset times
Browse the sunrise and sunset times for Ottawa in August 2026. Select a month to view Ottawa sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Saturday, 1st August 2026 | 04:47 | 19:30 |
| Sunday, 16th August 2026 | 05:05 | 19:08 |
| Monday, 31st August 2026 | 05:23 | 18:42 |
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