Weather in Regional Municipality of Waterloo for September 2025
Until now, September 2025 in Regional Municipality of Waterloo has been significantly cooler than historical averages by -2 °C, with average temperature of 21.6 °C.
The forecast for the next days in Regional Municipality of Waterloo predicts temperatures to be around 24 °C, close to the historical average.
In general, the average temperature in Regional Municipality of Waterloo at the beginning of September is 24 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.3 °C by the end of September.
Regional Municipality of Waterloo experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 57.8 mm.
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Regional Municipality of Waterloo Weather September
Temperatures trend during September in Regional Municipality of Waterloo
September weather in Regional Municipality of Waterloo day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 24° /11° | 0.1 mm | 6 | |
| 2 Sept. |  Mist | 22° /11° | 0 mm | 5 | |
| 3 Sept. |  Overcast | 27° /12° | 0 mm | 6 | |
| 4 Sept. | Overcast | 26° /13° | 9.9 mm | 6 | |
| 5 Sept. | Overcast | 27° /13° | 0 mm | 6 | |
| 6 Sept. |  Thundery outbreaks possible | 24° /13° | 4.6 mm | 5 | |
| 7 Sept. |  Moderate or heavy rain shower | 18° /11° | 5.4 mm | 4 | |
| 8 Sept. | Mist | 20° /9° | 0.1 mm | 4 | |
| 9 Sept. | Overcast | 24° /10° | 0.1 mm | 5 | |
| 10 Sept. |  Patchy rain possible | 23° /11° | 0.1 mm | 5 | |
| 11 Sept. |  Partly cloudy | 24° /13° | 0.8 mm | 6 | |
| 12 Sept. | Moderate or heavy rain shower | 25° /12° | 5.3 mm | 6 | |
| 13 Sept. |  Cloudy | 23° /12° | 0 mm | 6 | |
| 14 Sept. | Mist | 24° /10° | 0 mm | 6 | |
| 15 Sept. | Mist | 25° /11° | 0 mm | 6 | |
| 16 Sept. | Sunny | 26° /11° | 0 mm | 1.3 | |
| 17 Sept. | Sunny | 28° /12° | 0 mm | 1.3 | |
| 18 Sept. | Partly cloudy | 26° /12° | 0 mm | 1.3 | |
| 19 Sept. | Partly cloudy | 23° /10° | 0 mm | 1.4 | |
| 20 Sept. | Sunny | 21° /7° | 0 mm | 0 | |
| 21 Sept. | Patchy rain possible | 29° /12° | 0.9 mm | 4 | |
| 22 Sept. | Sunny | 32° /19° | 0 mm | 6 | |
| 23 Sept. | Patchy rain possible | 29° /15° | 0.9 mm | 5 | |
| 24 Sept. | Patchy rain possible | 27° /17° | 1.5 mm | 5 | |
| 25 Sept. | Patchy rain possible | 23° /12° | 0.2 mm | 4 | |
| 26 Sept. | Patchy rain possible | 17° /12° | 0.5 mm | 3 | |
| 27 Sept. | Patchy rain possible | 21° /11° | 0.1 mm | 3 | |
| 28 Sept. | Overcast | 19° /11° | 0.1 mm | 3 | |
| 29 Sept. | Sunny | 21° /10° | 0 mm | 4 | |
| 30 Sept. | Mist | 21° /13° | 0 mm | 5 | |
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Regional Municipality of Waterloo in September - FAQ
September rainfall patterns in Regional Municipality of Waterloo
UV exposure in Regional Municipality of Waterloo during September
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