Waterloo
September
Weather in Waterloo for September 2025
Your guide to Waterloo weather in September - trends and predictions
In general, the average temperature in 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.
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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Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
23°/12°
Temperatures
18 km/h
Avg max wind
73 %
Avg humidity
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 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 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.
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 ☀️
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