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Weather in Joliette for September 2026

Your guide to Joliette weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Joliette is slightly cooler than the historical average by 1.6 °C.

  • Expect cooler weather in the next days in Joliette with the forecast suggesting a temperature of 17.8 °C, lower than the historical average.

  • In general, the average temperature in Joliette at the beginning of September is 23.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °C by the end of September.

    • Rain 🌧️

  • The climate of Joliette in September is notably wet, with an average of 11 rainy days, and a total of 134.6 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
19
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/11°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Joliette Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
24°
2
Cloudy
22°
3
Mist
24°
4
Fog
24°
5
Fog
23°
6
Fog
23°
7
Light rain shower
23°
8
Light rain shower
19°
9
Sunny
20°
10
Patchy light rain
20°
11
Sunny
18°
12
Overcast
21°
13
Overcast
20°
14
Sunny
17°
15
Overcast
14°
16
Overcast
22°
17
Overcast
20°
18
Overcast
16°
19
Sunny
18°
20
Sunny
18°
21
Sunny
19°
22
Cloudy
18°
23
Overcast
11°
24
Sunny
17°
25
Moderate or heavy rain shower
15°
26
Sunny
18°
27
Sunny
21°
28
Sunny
21°
29
Mist
21°
30
Mist
19°

Temperatures trend during September in Joliette

See the weather trend as well as the moving average line

September weather in Joliette day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 24° /10° 1.7 mm 6
2 Sept. Cloudy
Cloudy
 22° /11° 8.4 mm 5
3 Sept. Mist
Mist
 24° /13° 18.5 mm 5
4 Sept. Fog
Fog
 24° /13° 5.1 mm 6
5 Sept. Fog
Fog
 23° /13° 16.2 mm 5
6 Sept. Fog
Fog
 23° /14° 0 mm 6
7 Sept. Light rain shower
Light rain shower
 23° /12° 3.7 mm 5
8 Sept. Light rain shower
Light rain shower
 19° /10° 4.6 mm 5
9 Sept. Sunny
Sunny
 20° /7° 3.8 mm 4
10 Sept. Patchy light rain
Patchy light rain
 20° /9° 6.5 mm 6
11 Sept. Sunny
Sunny
 18° /7° 0 mm 5.1
12 Sept. Overcast
Overcast
 21° /11° 0 mm 5.1
13 Sept. Overcast
Overcast
 20° /15° 1.6 mm 3.2
14 Sept. Sunny
Sunny
 17° /8° 0 mm 4.7
15 Sept. Overcast
Overcast
 14° /6° 1.7 mm 3
16 Sept. Overcast
Overcast
 22° /13° 0.6 mm 5
17 Sept. Overcast
Overcast
 20° /13° 0 mm 5
18 Sept. Overcast
Overcast
 16° /10° 0 mm 4
19 Sept. Sunny
Sunny
 18° /8° 0 mm 4
20 Sept. Sunny
Sunny
 18° /6° 0 mm 5
21 Sept. Sunny
Sunny
 19° /10° 0 mm 5
22 Sept. Cloudy
Cloudy
 18° /9° 0 mm 4
23 Sept. Overcast
Overcast
 11° /9° 0.3 mm 3
24 Sept. Sunny
Sunny
 17° /8° 0 mm 5
25 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /10° 38.7 mm 4
26 Sept. Sunny
Sunny
 18° /10° 57.4 mm 5
27 Sept. Sunny
Sunny
 21° /8° 0 mm 6
28 Sept. Sunny
Sunny
 21° /10° 0 mm 5
29 Sept. Mist
Mist
 21° /10° 0 mm 5
30 Sept. Mist
Mist
 19° /9° 0 mm 5
Next
Important Notice
Our weather forecast for Joliette in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Joliette forecast closer to your planned date for the most up-to-date weather information.
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Joliette in September - FAQ

What are the expected maximum and minimum temperatures in Joliette during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Joliette during September?
Significant rainfall exceeding 134.6 mm is expected in Joliette during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Joliette during September?
The average wind speed in Joliette during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Joliette

Explore the daily rainfall trends and prepare for Joliettes September weather 💧
Typically, Joliette has 11 rainy days in September with a total of 134.6 mm of rainfall.

UV exposure in Joliette during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Get accurate weather forecasts for Joliette, located at latitude 46.016 and longitude -73.424. Stay updated with localized weather information tailored for Joliette.

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