Montreal · September
Run in the morning.
Comfortable average high of 71°F, dipping to 56°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
71° / 56°F
Humidity
75%
Rain days
12/mo
Wind
11 mph
What September feels like in Montreal
Sunrise
06:33
Mid-month average
Sunset
19:04
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Montreal in September
The kit for September in Montreal: shorts and a short-sleeve are the standard kit.
September vs the surrounding months
vs August
-7° avg high
-4 rain days
Montreal in August →
September
71°F avg high
12 rain days
Best: morning
vs October
+13° avg high
-3 rain days
Montreal in October →
Frequently Asked Questions
What is the best time of day to run in Montreal in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Montreal in September?+
Average high 71°F, average low 56°F.
How does September compare to surrounding months in Montreal?+
Compared to August (avg high 77°F), September is cooler. Compared to October (avg high 57°F), September is warmer.
Does it rain often in Montreal in September?+
Expect about 12 measurable rain days in September, on average.