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Canada weather

Weather in Waterloo for September 2025

Your guide to Waterloo weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Waterloo is cooler than usual, with temperatures averaging 21.1 °C, this is -2.6 °C below the typical seasonal average.

  • The forecast for the next days in Waterloo predicts temperatures to be around 23 °C, close to the historical average.

  • In general, the average temperature in Waterloo at the beginning of September is 24 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °C by the end of September.

    • Rain 🌧️

  • Waterloo experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 57.8 mm.

    • More

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

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/12°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Waterloo Weather September

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

Temperatures trend during September in Waterloo

See the weather trend as well as the moving average line

September weather in Waterloo day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 24° /11° 0.1 mm 6
2 Sept. Mist
Mist
 22° /11° 0 mm 5
3 Sept. Overcast
Overcast
 27° /12° 0 mm 6
4 Sept. Overcast
Overcast
 26° /13° 9.9 mm 6
5 Sept. Overcast
Overcast
 27° /13° 0 mm 6
6 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 24° /13° 4.6 mm 5
7 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 18° /11° 5.4 mm 4
8 Sept. Mist
Mist
 20° /9° 0.1 mm 4
9 Sept. Overcast
Overcast
 24° /10° 0.1 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 23° /11° 0.1 mm 5
11 Sept. Partly cloudy
Partly cloudy
 24° /13° 0.8 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /12° 5.3 mm 6
13 Sept. Cloudy
Cloudy
 23° /12° 0 mm 6
14 Sept. Overcast
Overcast
 27° /12° 0 mm 1.1
15 Sept. Partly cloudy
Partly cloudy
 24° /13° 0 mm 1.4
16 Sept. Sunny
Sunny
 25° /12° 0 mm 1.3
17 Sept. Partly cloudy
Partly cloudy
 30° /16° 0 mm 1.3
18 Sept. Sunny
Sunny
 32° /14° 0 mm 0
19 Sept. Sunny
Sunny
 22° /9° 0 mm 5
20 Sept. Sunny
Sunny
 20° /6° 0 mm 4
21 Sept. Sunny
Sunny
 27° /8° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0.5 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 22° /17° 4.2 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 2.3 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 19° /11° 3.6 mm 4
26 Sept. Sunny
Sunny
 14° /5° 0 mm 3
27 Sept. Sunny
Sunny
 16° /4° 0 mm 3
28 Sept. Light drizzle
Light drizzle
 19° /12° 0.4 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
 20° /13° 0.1 mm 5
30 Sept. Mist
Mist
 21° /13° 0 mm 5
Next
Important Notice
Our weather forecast for Waterloo 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 Waterloo forecast closer to your planned date for the most up-to-date weather information.
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Waterloo in September - FAQ

What are the expected maximum and minimum temperatures in Waterloo during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Waterloo during September?
Moderate rainfall is anticipated in Waterloo during September, with a total of 57.8 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Waterloo during September?
The average wind speed in Waterloo during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Waterloo

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

UV exposure in Waterloo during September

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

Quick links

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Get accurate weather forecasts for Waterloo, located at latitude 43.467 and longitude -80.516. Stay updated with localized weather information tailored for Waterloo.

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