Are you considering a trip to Montreal in September? Well, the weather is usually on your side with an average maximum temperature of +70°F and about 7 sunny days. Just keep in mind that there may be some rain, with an average of 13 rainy days and 98 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+70°F
Avg. max. temperature
+27°F
Min.
+93°F
Max.
98 mm
Total precipitation
73%
Avg. humidity
3 m/s
Avg. wind
7 ☀️
Sunny Days
9 ⛅️
Cloudy
13 🌦
Rainy
Our opinion: Montreal has good weather in September.
Average temperature in Montreal in September
Here are the expected maximum, average and minimum temperatures in Montreal for September based on the historical data.
Last Year
Historical Data
The temperature in September is +73°F on average, with a range between a maximum of +90°F during the day and a minimum of +45°F at night.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +73°F to +73°F.
Is Montreal warm or cold in September?
Montreal is typically mild in September.
Maximum temperatures go down compared to the previous month from +77°F to +70°F. The minimum temperature also goes down from +63°F to +54°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Montreal:
Climate in Montreal in September
Montreal weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+77°F
+70°F
+55°F
Min. temperature
+43°F
+27°F
+21°F
Max. temperature
+95°F
+93°F
+86°F
Rainfall
102 mm
98 mm
113 mm
Wind
3 m/s
3 m/s
4 m/s
Humidity
71%
73%
73%
Air pressure
1014 HPa
1016 HPa
1015 HPa
Sunny days
6
7
5
Cloudy days
8
9
9
Rainy days
13
13
16
Snowy days
0
0
1
September weather is still as good as in August.It’s getting colder in September. From +77°F in the day, the average maximum temperature lowers to +70°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 102 mm to 98 mm.Humidity rises from 71% to 73%.The average wind speed doesn’t change much during September, staying around 3 m/s.The good news is there are likely to be more sunny days in September, from 6 to 7.
Next month (October) brings a further decline in the weather.
Wind speed in Montreal in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Montreal is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Montreal based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 20%, leading to total precipitation of around 70 mm. The maximum amount of rainfall per day is around 27 mm, which is moderate rain.On average, there are about 6 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Montreal wettest month is October, where a typical day has a 52% chance of precipitation and 113 mm of rainfall per day. February, on the other hand, is the driest month with a mere 7% chance of precipitation and 17 mm of rainfall per day.
How was the weather last September in Montreal?
This is the weather in Montreal in September 2023:
1 September
☀️
+74°F
2 September
☀️
+76°F
3 September
☀️
+83°F
4 September
☀️
+86°F
5 September
☀️
+89°F
6 September
☀️
+89°F
7 September
☀️
+86°F
8 September
🌧️
+79°F
9 September
☀️
+74°F
10 September
🌧️
+67°F
11 September
☁️
+73°F
12 September
☁️
+71°F
13 September
🌧️
+74°F
14 September
☁️
+67°F
15 September
☀️
+72°F
16 September
☀️
+74°F
17 September
☀️
+74°F
18 September
🌧️
+68°F
19 September
🌧️
+63°F
20 September
☀️
+69°F
21 September
☀️
+71°F
22 September
☀️
+74°F
23 September
☀️
+71°F
24 September
☀️
+74°F
25 September
☀️
+69°F
26 September
☀️
+66°F
27 September
☀️
+69°F
28 September
☀️
+70°F
29 September
☀️
+69°F
30 September
☀️
+74°F
In September 2023 Montreal had 22 sunny days, 3 cloudy days, and 5 rainy days. The average maximum temperature was +73°F, with an absolute maximum of +90°F and a minimum of +63°F. The average humidity was 82%, with a maximum of 100% and a minimum of 48%. The average wind speed was 3 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Montreal climate has changed over the last 43 years.
The climate in Montreal in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1980 (+51°F) and the highest in 2021 (+56°F). The driest year was 1985 with only 524 mm of rainfall, and the wettest year was 2023 with 2843 mm.
FAQ
Frequently asked questions about the weather in Montreal in September:
Is September a good time to visit Montreal?
September is a really good time to go to Montreal. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Montreal.
Can you sunbathe in Montreal in September?
September has mild temperatures in Montreal. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is Montreal rainy in September?
Montreal is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Montreal in September?
Usually, it’s not very sunny in Montreal in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Montreal, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.