What is the weather like in Montreal vs Ottawa in September?

In September, Montreal averages 21°C high / 13°C low with about 75 mm of rain; Ottawa averages 22°C high / 11°C low with about 66 mm.

Montreal vs Ottawa in September

Montreal and Ottawa are nearly tied in September — 89 vs 89 on SeasonMap's comfort score. Montreal is nice, a little rain, clean air; Ottawa is nice, a little rain, clean air.

Montreal vs Ottawa — September climate, side by side

	🇨🇦 Montreal	🇨🇦 Ottawa
Comfort score	89/100 (A)	89/100 (A)
Feels-like high	20°C	22°C
Avg high / low	21° / 13°	22° / 11°
Rainfall	75 mm	66 mm
Rainy days	7	7
Humidity	74%	75%
Air quality (AQI)	47	39

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Montreal vs Ottawa in September — FAQ

Is September better in Montreal or Ottawa?: Montreal and Ottawa are nearly tied in September — 89 vs 89 on SeasonMap's comfort score. Montreal is nice, a little rain, clean air; Ottawa is nice, a little rain, clean air.
What is the weather like in Montreal vs Ottawa in September?: In September, Montreal averages 21°C high / 13°C low with about 75 mm of rain; Ottawa averages 22°C high / 11°C low with about 66 mm.