Early autumn · Weather & things to do
Montréal in September
Montréal cools off: highs slip to 73°F (23°C), from 79°F in August, with lows of 53°F (11°C) and about 3.5 in (88 mm) of rain.
At 86/100 for comfort (the top score of the year), it's one of the best months to visit.
- Avg high
- 73°F (23°C)
- Avg low
- 53°F (11°C)
- Rain
- 3.5 in (88 mm)
- Humidity
- 75%
- Cloud cover
- 54%
- Daylight
- ~12 h 18 min
- Comfort score
- 86/100 · Great
What September feels like
Warm afternoons near 73°F (23°C) make long days outdoors easy.
Nights cool to an average low of 53°F (11°C).
Some rain is likely, about 3.5 in (88 mm) in the month, so pack for a shower or two.
Plan around September
September is one of Montréal's best months on the climate data.
- Last warm month for a while: October highs fall to 56°F.
- Last of the best-scoring months: by October, the score drops to 65/100.
- Comfort improves from 81/100 in August to 86/100.
- September sits inside the Jun – Oct window our Montréal, Québec City & Charlevoix route recommends.
What to pack for September
- Light, breathable clothes73°F afternoons
- Packable rain jacket or umbrellaabout 3.5 in of rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Montréal in September
September is good outdoor weather here, so these picks lean toward the open air.
Mount Royal Park
Olmsted-designed park with the Kondiaronk Belvedere overlooking downtown and the river.
Why now September scores 86/100 for comfort, good conditions for being outside.
Joe Beef
Little Burgundy bistro known for rich market cooking, oysters and a deep wine list.
Schwartz's Deli
Smoked-meat institution since 1928, serving hand-cut brisket on rye with mustard.
Notre-Dame Basilica
Gothic Revival basilica with a deep-blue, gold-starred interior and carved wood altarpiece.
Old Montréal
Cobbled lanes, 18th-century stone buildings and the Old Port waterfront along the St. Lawrence.
Why now Highs near 73°F and 3.5 in of monthly rain make this an easy outdoor pick.
Nearby in September
- Mont-Tremblant in September~69 mi · highs 67°F, 3.9 in rain · 3°C (5°F) cooler by day, about as wet
- Vermont in September~81 mi · highs 69°F, 3.6 in rain · 2°C (3°F) cooler by day, about as wet
- Stowe in September~84 mi · highs 69°F, 3.6 in rain · 2°C (3°F) cooler by day, about as wet
- White Mountains in September~140 mi · highs 50°F, 3.6 in rain · 13°C (23°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Montréal in September: quick answers
Is September a good time to visit Montréal?
Yes. On the climate data it's one of the best months, scoring 86/100. Expect highs of 73°F (23°C) and 3.5 in (88 mm) of rain. September is inside the Jun – Oct window our Montréal, Québec City & Charlevoix route recommends.
How hot is Montréal in September?
Average highs are 73°F (23°C) and average lows 53°F (11°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Montréal in September?
Some: about 3.5 in (88 mm) of rain falls across September on average, the 5th-driest month of the year. The annual total is about 42.8 in (1087 mm).
What should I pack for Montréal in September?
Bring light, breathable clothes (73°F afternoons), packable rain jacket or umbrella (about 3.5 in of rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Montréal
Routes in season in September
- Montréal, Québec City & Charlevoix Jun – Oct
Planning Montréal in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.