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Weather in Châteauguay for September 2025

Your guide to Châteauguay weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Châteauguay is slightly cooler than the historical average by -0.6 °C.

  • Expect cooler weather in the next days in Châteauguay with the forecast suggesting a temperature of 21.9 °C, lower than the historical average.

  • In general, the average temperature in Châteauguay at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • With an average of 3 rainy days, Châteauguay experiences minimal rainfall in September.

    • More

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

Average dry days
27
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/9°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Châteauguay Weather September

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

Temperatures trend during September in Châteauguay

See the weather trend as well as the moving average line

September weather in Châteauguay day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /11° 2.8 mm 5
2 Sept. Mist
Mist
 23° /13° 0 mm 5
3 Sept. Mist
Mist
 24° /13° 0 mm 6
4 Sept. Mist
Mist
 27° /14° 9.6 mm 6
5 Sept. Mist
Mist
 26° /15° 6.7 mm 6
6 Sept. Cloudy
Cloudy
 25° /16° 9.6 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 22° /13° 9.1 mm 5
8 Sept. Light rain shower
Light rain shower
 20° /11° 16.3 mm 5
9 Sept. Overcast
Overcast
 21° /9° 0 mm 5
10 Sept. Light rain shower
Light rain shower
 21° /11° 5.4 mm 5
11 Sept. Overcast
Overcast
 22° /12° 2 mm 5
12 Sept. Mist
Mist
 23° /11° 1 mm 5
13 Sept. Moderate rain
Moderate rain
 20° /13° 4.4 mm 5
14 Sept. Overcast
Overcast
 22° /13° 0.4 mm 5
15 Sept. Partly cloudy
Partly cloudy
 24° /12° 0 mm 6
16 Sept. Sunny
Sunny
 27° /12° 0 mm 1.2
17 Sept. Partly cloudy
Partly cloudy
 25° /12° 0 mm 1.1
18 Sept. Moderate rain
Moderate rain
 27° /17° 9.7 mm 1.1
19 Sept. Moderate rain
Moderate rain
 19° /10° 13.5 mm 1.1
20 Sept. Sunny
Sunny
 17° /8° 0 mm 0
21 Sept. Partly cloudy
Partly cloudy
 25° /9° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 30° /16° 0.2 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 30° /19° 0.7 mm 5
24 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 0.2 mm 4
25 Sept. Overcast
Overcast
 18° /12° 0 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 16° /9° 0.3 mm 3
27 Sept. Patchy rain possible
Patchy rain possible
 13° /8° 0.2 mm 3
28 Sept. Sunny
Sunny
 16° /6° 0 mm 4
29 Sept. Sunny
Sunny
 21° /8° 0 mm 4
30 Sept. Mist
Mist
 23° /11° 0 mm 5
Next
Important Notice
Our weather forecast for Châteauguay 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 Châteauguay forecast closer to your planned date for the most up-to-date weather information.
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Châteauguay in September - FAQ

What are the expected maximum and minimum temperatures in Châteauguay during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Châteauguay during September?
Significant rainfall exceeding 419 mm is expected in Châteauguay during September, occurring over more than 3 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Châteauguay during September?
The average wind speed in Châteauguay during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Châteauguay

Explore the daily rainfall trends and prepare for Châteauguays September weather 💧

UV exposure in Châteauguay during September

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

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Location coordinates Where is Châteauguay?

Get accurate weather forecasts for Châteauguay, located at latitude 45.383 and longitude -73.749. Stay updated with localized weather information tailored for Châteauguay.

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