Month-by-month travel weather
Ottawa September weather
Ottawa, Canada · September
Cooler nights return
Heat drops and exploring feels easier. Evenings can feel cool—bring a layer.
September averages at a glance
Average low
around 10–12°C
Average high
around 19–22°C
Average precipitation
around 60–95 mm
Precip days
about 8–11 days
What to wear in September in Ottawa
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light clothing + thin evening layer
- • Optional umbrella
Travel tips for visiting Ottawa in September
- • If you’re out late, a thin jacket is a high-use item.
September weather in Ottawa — FAQ
Q. Is September a good time to visit?
A. Often yes—comfortable temperatures for outdoor plans.
Explore Ottawa
These pages are connected so you can compare conditions and decide for yourself.