Weather in Longueuil for September 2026
Until now, September 2026 in Longueuil has been nearly identical to the historical average, with a temperature of 24 °C (showing only a slight deviation of 0 °C).
Expect cooler weather in the next days in Longueuil with the forecast suggesting a temperature of 20 °C, lower than the historical average.
In general, the average temperature in Longueuil at the beginning of September is 24.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °C by the end of September.
The climate of Longueuil in September is notably wet, with an average of 13 rainy days, and a total of 170.2 mm of precipitation.
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Longueuil Weather September
Temperatures trend during September in Longueuil
September weather in Longueuil day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Mist | 25° /12° | 1 mm | 5 | |
| 2 Sept. | Mist | 24° /13° | 30.8 mm | 5 | |
| 3 Sept. | Mist | 26° /15° | 37.7 mm | 6 | |
| 4 Sept. |  Partly cloudy | 26° /15° | 8.9 mm | 7 | |
| 5 Sept. | Mist | 25° /15° | 12.8 mm | 5 | |
| 6 Sept. | Mist | 24° /15° | 9.9 mm | 6 | |
| 7 Sept. |  Patchy light rain with thunder | 24° /13° | 4.9 mm | 5 | |
| 8 Sept. |  Light rain shower | 21° /12° | 17.9 mm | 4 | |
| 9 Sept. |  Overcast | 21° /9° | 5.1 mm | 4 | |
| 10 Sept. | Light rain shower | 22° /11° | 3.7 mm | 4 | |
| 11 Sept. |  Sunny | 22° /10° | 0 mm | 5.2 | |
| 12 Sept. | Overcast | 24° /12° | 0 mm | 5.2 | |
| 13 Sept. | Overcast | 25° /17° | 5.1 mm | 3.4 | |
| 14 Sept. | Sunny | 19° /12° | 0 mm | 4.9 | |
| 15 Sept. | Overcast | 19° /9° | 0 mm | 4 | |
| 16 Sept. | Overcast | 22° /16° | 5.2 mm | 5 | |
| 17 Sept. | Overcast | 19° /14° | 3.1 mm | 4 | |
| 18 Sept. | Patchy rain possible | 17° /13° | 0.2 mm | 5 | |
| 19 Sept. | Sunny | 19° /11° | 0 mm | 5 | |
| 20 Sept. | Sunny | 18° /9° | 0 mm | 5 | |
| 21 Sept. | Sunny | 22° /13° | 0 mm | 6 | |
| 22 Sept. | Overcast | 21° /12° | 0 mm | 5 | |
| 23 Sept. | Patchy rain possible | 13° /10° | 2.8 mm | 3 | |
| 24 Sept. | Sunny | 20° /10° | 0 mm | 5 | |
| 25 Sept. |  Moderate or heavy rain shower | 18° /11° | 39.7 mm | 4 | |
| 26 Sept. | Mist | 20° /10° | 55.8 mm | 5 | |
| 27 Sept. | Mist | 20° /8° | 0 mm | 5 | |
| 28 Sept. | Mist | 22° /11° | 0 mm | 5 | |
| 29 Sept. | Mist | 23° /10° | 0 mm | 6 | |
| 30 Sept. | Mist | 22° /9° | 0 mm | 5 | |
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Longueuil in September - FAQ
What are the expected maximum and minimum temperatures in Longueuil during September?
How much rainfall should be expected in Longueuil during September?
What are the typical wind conditions in Longueuil during September?
September rainfall patterns in Longueuil
UV exposure in Longueuil during September
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