Ottawa Weather in August
August in Ottawa averages 28°C (82°F) during the day and 17°C (63°F) at night. Quite a bit of rainfall is typical this month, with around 127 mm (5 in) on average. An umbrella is a good idea.
Rainfall in Ottawa in August
Past climate data indicates that roughly 10 days will see rain, totalling around 127 mm (5 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Ottawa in August
August in Ottawa brings typical temperatures with highs around 28°C (82°F) and lows of 17°C (63°F). This kind of day-to-night contrast is typical for this time of year. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.For Ottawa itself, July and September generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Ottawa's climate page.
Ottawa Temperature in August
Min Temperature
17°C (63°F)
Max Temperature
28°C (82°F)
Chance of Rain
34%
Precipitation
127 mm (5 in)
Rainy days
10 days
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
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tolerable
unpleasant
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What to Wear in Ottawa in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho.What To Do in Ottawa in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Ottawa's climate page.
See the full Ottawa climate overview or explore weather in the United States of America.
