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Weather in Regional Municipality of Waterloo for September 2025

Your guide to Regional Municipality of Waterloo weather in September - trends and predictions
  • In general, the average temperature in Regional Municipality of Waterloo at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °C by the end of September.

  • With an average of 5 rainy days, Regional Municipality of Waterloo experiences minimal rainfall in September.

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Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/11°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Regional Municipality of Waterloo in September average weather

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Temperatures trend during September in Regional Municipality of Waterloo

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
23° /10° 0.2 mm 6
2 Sept. Mist
Mist
21° /10° 0 mm 6
3 Sept. Overcast
Overcast
27° /12° 0 mm 7
4 Sept. Overcast
Overcast
29° /14° 0 mm 7
5 Sept. Overcast
Overcast
30° /15° 0 mm 8
6 Sept. Thundery outbreaks possible
Thundery outbreaks possible
27° /16° 6.9 mm 6
7 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
20° /12° 8.1 mm 5
8 Sept. Mist
Mist
20° /11° 0.1 mm 5
9 Sept. Overcast
Overcast
23° /10° 0.1 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
24° /11° 0.1 mm 6
11 Sept. Light rain shower
Light rain shower
24° /12° 1.2 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
25° /13° 7.9 mm 6
13 Sept. Cloudy
Cloudy
22° /11° 0 mm 6
14 Sept. Mist
Mist
23° /9° 0 mm 6
15 Sept. Mist
Mist
25° /10° 0 mm 6
16 Sept. Mist
Mist
26° /10° 0 mm 6
17 Sept. Light rain shower
Light rain shower
23° /12° 1.9 mm 5
18 Sept. Fog
Fog
22° /11° 0 mm 5
19 Sept. Fog
Fog
21° /11° 0 mm 5
20 Sept. Mist
Mist
24° /7° 0 mm 5
21 Sept. Fog
Fog
25° /14° 4.6 mm 6
22 Sept. Mist
Mist
23° /13° 3.3 mm 5
23 Sept. Mist
Mist
23° /12° 14.1 mm 5
24 Sept. Cloudy
Cloudy
21° /13° 5.7 mm 5
25 Sept. Overcast
Overcast
23° /13° 3 mm 5
26 Sept. Fog
Fog
22° /11° 0 mm 5
27 Sept. Overcast
Overcast
19° /8° 0 mm 5
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
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Important Notice
Our weather forecast for Regional Municipality of 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 Regional Municipality of Waterloo forecast closer to your planned date for the most up-to-date weather information.

Regional Municipality of Waterloo in September - FAQ

What are the expected maximum and minimum temperatures in Regional Municipality of Waterloo during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Regional Municipality of Waterloo during September?
In September, Regional Municipality of Waterloo can expect light to moderate rainfall, totaling 38.8 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Regional Municipality of Waterloo during September?
The average wind speed in Regional Municipality of Waterloo during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Regional Municipality of Waterloo

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

UV exposure in Regional Municipality of Waterloo during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Regional Municipality of Waterloo?

Get accurate weather forecasts for Regional Municipality of Waterloo, located at latitude 43.425 and longitude -80.511. Stay updated with localized weather information tailored for Regional Municipality of Waterloo.

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