Weather in Regional Municipality of Waterloo for September 2026
Until now, September 2026 in Regional Municipality of Waterloo is slightly cooler than the historical average by 1.4 °C.
An exceptional deviation from the historical average is forecasted for next days of September 2026 in Regional Municipality of Waterloo with the forecasted temperature being 16.9 °C, much lower than usual.
In general, the average temperature in Regional Municipality of Waterloo at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.6 °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 69.8 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 | 26° /13° | 0.1 mm | 7 | |
| 2 Sept. |  Mist | 24° /13° | 4.6 mm | 5 | |
| 3 Sept. |  Overcast | 27° /13° | 4.5 mm | 5 | |
| 4 Sept. | Sunny | 26° /14° | 7.4 mm | 6 | |
| 5 Sept. | Overcast | 26° /13° | 0 mm | 7 | |
| 6 Sept. |  Thundery outbreaks possible | 24° /13° | 3.5 mm | 6 | |
| 7 Sept. |  Moderate or heavy rain shower | 20° /11° | 4.1 mm | 4 | |
| 8 Sept. | Mist | 21° /9° | 0.1 mm | 4 | |
| 9 Sept. | Overcast | 24° /11° | 1.8 mm | 4 | |
| 10 Sept. |  Patchy rain possible | 23° /12° | 0.2 mm | 5 | |
| 11 Sept. |  Partly cloudy | 24° /12° | 0.6 mm | 6 | |
| 12 Sept. | Moderate or heavy rain shower | 25° /12° | 4 mm | 5 | |
| 13 Sept. |  Cloudy | 23° /12° | 0.1 mm | 5 | |
| 14 Sept. | Mist | 22° /9° | 0 mm | 6 | |
| 15 Sept. | Mist | 24° /11° | 0.7 mm | 5 | |
| 16 Sept. | Mist | 25° /12° | 0 mm | 5 | |
| 17 Sept. | Light rain shower | 23° /13° | 1 mm | 4 | |
| 18 Sept. | Fog | 23° /11° | 0 mm | 5 | |
| 19 Sept. | Cloudy | 20° /10° | 0 mm | 4 | |
| 20 Sept. | Mist | 22° /8° | 0 mm | 4 | |
| 21 Sept. | Fog | 22° /11° | 3.6 mm | 4 | |
| 22 Sept. | Mist | 22° /11° | 13.7 mm | 5 | |
| 23 Sept. | Mist | 22° /12° | 7 mm | 5 | |
| 24 Sept. | Cloudy | 20° /12° | 3.8 mm | 5 | |
| 25 Sept. | Overcast | 22° /12° | 3.3 mm | 5 | |
| 26 Sept. | Fog | 21° /11° | 0 mm | 4 | |
| 27 Sept. | Sunny | 22° /11° | 0 mm | 4.8 | |
| 28 Sept. | Overcast | 20° /11° | 0 mm | 4.2 | |
| 29 Sept. | Overcast | 22° /14° | 0 mm | 3.7 | |
| 30 Sept. | Overcast | 24° /12° | 0 mm | 2.3 | |
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Regional Municipality of Waterloo in September - FAQ
What are the expected maximum and minimum temperatures in Regional Municipality of Waterloo during September?
How much rainfall should be expected in Regional Municipality of Waterloo during September?
What are the typical wind conditions in Regional Municipality of Waterloo during September?
September rainfall patterns in Regional Municipality of Waterloo
UV exposure in Regional Municipality of Waterloo during September
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