Longueuil Weather in September

Thinking of visiting Longueuil in September? Expect high temperatures reaching 22°C (72°F) during the day, dropping to 11°C (52°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Longueuil in September

The climate data from previous years indicates about 11 days of rain, averaging 103 mm (4.1 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Longueuil in September

Daytime temperatures in Longueuil reach 22°C (72°F) in September, dropping to 11°C (52°F) at night. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Longueuil in September

The month brings about 183 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Longueuil in September

Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Average water temperature in September

At 20°C (68°F), the water is pleasant for swimming. Most people find this range ideal — cool enough to be refreshing, warm enough to stay in comfortably.

If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August and September typically offer the best circumstances for Longueuil.

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• January
• February
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• May
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• October
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For a detailed overview over the year and the best time to visit Canada, check out our Longueuil's climate page.

Longueuil Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 22°C (72°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 38%  

Precipitation 103 mm (4.1 in)  

Rainy days 11 days  

Humidity 60% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 183 hours *  

Percentage Sunshine 49% *  

* Data from: Montréal, Canada (4 KM, 2 Miles).

What to Wear in Longueuil in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 20°C (68°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Longueuil in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Canada, check out our Longueuil's climate page.

More climate data for Longueuil

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Longueuil climate overview or explore weather in Canada.