Weather in Montréal in August
August in Montréal is mild with average temperatures around 21.0°C (69.8°F). Moderate rainfall of 98mm spread over 14 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
26.1°C
79.0°F
Low
15.9°C
60.6°F
Precipitation
98 mm
3.8 inches
~14 rainy days
Conditions
Humidity
74%
Comparison to Adjacent Months
August is 4.1°C warmer than September.