Weather in Montréal in September
September in Montréal is mild with average temperatures around 16.9°C (62.4°F). Moderate rainfall of 88mm spread over 11 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
22.4°C
72.3°F
Low
11.4°C
52.5°F
Precipitation
88 mm
3.5 inches
~11 rainy days
Conditions
Humidity
75%
Comparison to Adjacent Months
September is 4.1°C cooler than August.
September is 7.9°C warmer than October, 26mm drier than October.