Month-by-month travel weather
Ottawa August weather
Ottawa, Canada · August
Thunderstorms are still possible
Heat lingers, with occasional storms. Comfort depends on humidity day to day.
August averages at a glance
Average low
around 16–18°C
Average high
around 24–27°C
Average precipitation
around 70–105 mm
Precip days
about 8–11 days
What to wear in August in Ottawa
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Breathable clothing
- • Optional indoor layer
Travel tips for visiting Ottawa in August
- • Pair water with electrolytes if you sweat a lot.
August weather in Ottawa — FAQ
Q. Is August humid too?
A. It can be—humidity is often the main comfort variable.
Explore Ottawa
These pages are connected so you can compare conditions and decide for yourself.