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.
With an average of 5 rainy days, Waterloo experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
- New! Chat with our AI weatherman - it’s amazing and free.
25
Dry days
5
Rainy days
0
Snow days
24°/11°
Temperatures
18 km/h
Avg max wind
73 %
Avg humidity
Waterloo in September average weather
Move between months or click on a day
| 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° |
You can click on date
Access Waterloo weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Waterloo
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| 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 | |
| Next | |||||
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 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 Waterloo during September?
In September, 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 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 ☀️
Quick links
You are here
Where is Waterloo?Get accurate weather forecasts for Waterloo, located at latitude 43.467 and longitude -80.516. Stay updated with localized weather information tailored for Waterloo.
Found a mistake?
We appreciate your attention to details. Tell us here.