Montreal Weather in September: Climate, Temperature & Travel Tips
Avg 17.2°C · 88mm rain — September is autumn in Montreal.
- Avg high
- 21.6 °C
- Avg low
- 12.8 °C
- Avg
- 17.2 °C
- Precipitation
- 88 mm
Source: Open-Meteo Archive 2014–2023 · 10-year climate normals
Climate Overview
September in Montreal, Canada brings autumn conditions: average temperature 17.2°C, average high 21.6°C, average low 12.8°C. Monthly rainfall averages 88mm, making it a moderate-rainfall time of year.
Conditions are pleasant for most travel activities.
What to Pack
- Light layers (long sleeves + light jacket for evenings)
- Comfortable walking shoes
- A light rain jacket as backup
Best Things to Do
- Walking tours and city exploration
- Parks and outdoor cafes
- Seasonal food and night markets (where applicable)
Pros and Cons of Visiting in September
Pros:
- Pleasant temperatures for walking and outdoor sightseeing
- Shoulder season often means smaller crowds and lower prices
Cons:
- No major weather drawbacks for typical activities
Climate source: Open-Meteo Archive (2014–2023).
Colour = avg temperature · blue = cool · orange = warm
- 1 July 22.0°C
- 2 August 21.2°C
- 3 June 19.2°C
- 1 January -7.4°C
- 2 February -6.4°C
- 3 December -4.0°C
FAQ
01 What is the average temperature in Montreal in September? +
The average is 17.2°C, with a high of 22°C and a low of 13°C.
02 What is Montreal like to visit in September? +
It is autumn in Montreal, which is ideal for outdoor exploration.
03 Does it rain often in Montreal during September? +
Average rainfall is 88mm, which is moderate.
04 What should I pack for Montreal in September? +
Light layers (long sleeves + light jacket for evenings); Comfortable walking shoes.
05 Is September a peak travel season for Montreal? +
It is closer to off-season, with more reasonable prices and fewer crowds.
06 Where does this climate data come from? +
Monthly averages computed from Open-Meteo Archive 2014–2023 daily observations.
- Sources
- Open-Meteo Archive 2014-2023
- Updated
- 2026-04-17