Regional Municipality of Waterloo
September
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, ensuring that most days remain pleasantly dry.
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25
Dry days
5
Rainy days
0
Snow days
24°/11°
Temperatures
18 km/h
Avg max wind
73 %
Avg humidity
Regional Municipality of Waterloo in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  21° | 3  27° | 4 29° | 5 30° | 6  27° | 7  20° |
| 8 20° | 9 23° | 10  24° | 11 24° | 12 25° | 13  22° | 14 23° |
| 15 25° | 16 26° | 17 23° | 18 22° | 19 21° | 20 24° | 21 25° |
| 22 23° | 23 23° | 24 21° | 25 23° | 26 22° | 27 19° | 28  19° |
| 29 20° | 30 21° |
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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 | 23° /10° | 0.2 mm | 6 | |
| 2 Sept. | Mist | 21° /10° | 0 mm | 6 | |
| 3 Sept. | Overcast | 27° /12° | 0 mm | 7 | |
| 4 Sept. | Overcast | 29° /14° | 0 mm | 7 | |
| 5 Sept. | Overcast | 30° /15° | 0 mm | 8 | |
| 6 Sept. | Thundery outbreaks possible | 27° /16° | 6.9 mm | 6 | |
| 7 Sept. | Moderate or heavy rain shower | 20° /12° | 8.1 mm | 5 | |
| 8 Sept. | Mist | 20° /11° | 0.1 mm | 5 | |
| 9 Sept. | Overcast | 23° /10° | 0.1 mm | 5 | |
| 10 Sept. | Patchy rain possible | 24° /11° | 0.1 mm | 6 | |
| 11 Sept. | Light rain shower | 24° /12° | 1.2 mm | 6 | |
| 12 Sept. | Moderate or heavy rain shower | 25° /13° | 7.9 mm | 6 | |
| 13 Sept. | Cloudy | 22° /11° | 0 mm | 6 | |
| 14 Sept. | Mist | 23° /9° | 0 mm | 6 | |
| 15 Sept. | Mist | 25° /10° | 0 mm | 6 | |
| 16 Sept. | Mist | 26° /10° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 23° /12° | 1.9 mm | 5 | |
| 18 Sept. | Fog | 22° /11° | 0 mm | 5 | |
| 19 Sept. | Fog | 21° /11° | 0 mm | 5 | |
| 20 Sept. | Mist | 24° /7° | 0 mm | 5 | |
| 21 Sept. | Fog | 25° /14° | 4.6 mm | 6 | |
| 22 Sept. | Mist | 23° /13° | 3.3 mm | 5 | |
| 23 Sept. | Mist | 23° /12° | 14.1 mm | 5 | |
| 24 Sept. | Cloudy | 21° /13° | 5.7 mm | 5 | |
| 25 Sept. | Overcast | 23° /13° | 3 mm | 5 | |
| 26 Sept. | Fog | 22° /11° | 0 mm | 5 | |
| 27 Sept. | Overcast | 19° /8° | 0 mm | 5 | |
| 28 Sept. | Light drizzle | 19° /12° | 0.4 mm | 5 | |
| 29 Sept. | Patchy rain possible | 20° /13° | 0.1 mm | 5 | |
| 30 Sept. | 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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