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Weather in Mississauga for September 2025

Your guide to Mississauga weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Mississauga is cooler than usual, with temperatures averaging 22.1 °C, this is -2.1 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Mississauga with the forecast suggesting a temperature of 22.4 °C, lower than the historical average.

  • In general, the average temperature in Mississauga at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • Mississauga experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 45 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/15°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Mississauga Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
25°
2
Mist
24°
3
Thundery outbreaks possible
27°
4
Partly cloudy
27°
5
Cloudy
28°
6
Thundery outbreaks possible
25°
7
Light rain shower
19°
8
Overcast
21°
9
Overcast
22°
10
Overcast
23°
11
Patchy rain possible
24°
12
Light rain shower
25°
13
Overcast
23°
14
Sunny
27°
15
Partly cloudy
23°
16
Sunny
26°
17
Overcast
29°
18
Sunny
32°
19
Sunny
20°
20
Sunny
19°
21
Sunny
24°
22
Patchy rain possible
21°
23
Patchy rain possible
21°
24
Patchy rain possible
23°
25
Moderate rain
20°
26
Sunny
14°
27
Sunny
15°
28
Patchy rain possible
18°
29
Overcast
19°
30
Mist
20°

Temperatures trend during September in Mississauga

See the weather trend as well as the moving average line

September weather in Mississauga day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 25° /14° 0.1 mm 6
2 Sept. Mist
Mist
 24° /13° 0.3 mm 5
3 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 27° /15° 0.4 mm 7
4 Sept. Partly cloudy
Partly cloudy
 27° /16° 7.8 mm 7
5 Sept. Cloudy
Cloudy
 28° /16° 0 mm 7
6 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 25° /16° 4.1 mm 5
7 Sept. Light rain shower
Light rain shower
 19° /13° 3.8 mm 4
8 Sept. Overcast
Overcast
 21° /11° 0 mm 4
9 Sept. Overcast
Overcast
 22° /12° 0.7 mm 5
10 Sept. Overcast
Overcast
 23° /13° 0 mm 5
11 Sept. Patchy rain possible
Patchy rain possible
 24° /15° 0.1 mm 6
12 Sept. Light rain shower
Light rain shower
 25° /15° 1.6 mm 6
13 Sept. Overcast
Overcast
 23° /14° 0 mm 6
14 Sept. Sunny
Sunny
 27° /14° 0 mm 1.1
15 Sept. Partly cloudy
Partly cloudy
 23° /15° 0 mm 1.3
16 Sept. Sunny
Sunny
 26° /12° 0 mm 1.3
17 Sept. Overcast
Overcast
 29° /17° 0 mm 1.3
18 Sept. Sunny
Sunny
 32° /16° 0 mm 0
19 Sept. Sunny
Sunny
 20° /11° 0 mm 5
20 Sept. Sunny
Sunny
 19° /9° 0 mm 4
21 Sept. Sunny
Sunny
 24° /9° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 21° /13° 0.8 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 21° /17° 3.7 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 23° /17° 0.7 mm 4
25 Sept. Moderate rain
Moderate rain
 20° /12° 13.1 mm 4
26 Sept. Sunny
Sunny
 14° /6° 0 mm 3
27 Sept. Sunny
Sunny
 15° /5° 0 mm 3
28 Sept. Patchy rain possible
Patchy rain possible
 18° /14° 0 mm 4
29 Sept. Overcast
Overcast
 19° /16° 1.6 mm 5
30 Sept. Mist
Mist
 20° /14° 0 mm 5
Next
Important Notice
Our weather forecast for Mississauga 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 Mississauga forecast closer to your planned date for the most up-to-date weather information.
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Mississauga in September - FAQ

What are the expected maximum and minimum temperatures in Mississauga during September?
During September, expect a variety of temperatures with highs around 23° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Mississauga during September?
In September, Mississauga can expect light to moderate rainfall, totaling 45 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Mississauga during September?
The average wind speed in Mississauga during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Mississauga

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

UV exposure in Mississauga 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 Mississauga, located at latitude 43.579 and longitude -79.658. Stay updated with localized weather information tailored for Mississauga.

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