Simcoe County (Alliston)
September
Weather in Simcoe County for September 2025
Your guide to Simcoe County weather in September - trends and predictions
In general, the average temperature in Simcoe County at the beginning of September is 25.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.3 °C by the end of September.
Simcoe County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 85.8 mm.
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Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
22°/12°
Temperatures
16 km/h
Avg max wind
73 %
Avg humidity
Simcoe County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  21° | 3 28° | 4 29° | 5 31° | 6  25° | 7  19° |
| 8  19° | 9  21° | 10 22° | 11 24° | 12  24° | 13 22° | 14  23° |
| 15 25° | 16 26° | 17 22° | 18 22° | 19 21° | 20  23° | 21 24° |
| 22 23° | 23 20° | 24 21° | 25 22° | 26 20° | 27 18° | 28 20° |
| 29 21° | 30 20° |
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Temperatures trend during September in Simcoe County
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. | Partly cloudy | 23° /12° | 0 mm | 6 | |
| 2 Sept. | Light rain shower | 21° /10° | 0.3 mm | 6 | |
| 3 Sept. | Partly cloudy | 28° /13° | 1 mm | 7 | |
| 4 Sept. | Patchy rain possible | 29° /15° | 0.4 mm | 7 | |
| 5 Sept. | Partly cloudy | 31° /16° | 0 mm | 8 | |
| 6 Sept. | Thundery outbreaks possible | 25° /17° | 12.4 mm | 6 | |
| 7 Sept. | Moderate or heavy rain shower | 19° /11° | 12 mm | 5 | |
| 8 Sept. | Overcast | 19° /8° | 0.3 mm | 5 | |
| 9 Sept. | Mist | 21° /9° | 3.2 mm | 5 | |
| 10 Sept. | Overcast | 22° /13° | 0 mm | 6 | |
| 11 Sept. | Light rain shower | 24° /13° | 0.9 mm | 6 | |
| 12 Sept. | Heavy rain | 24° /13° | 15.7 mm | 6 | |
| 13 Sept. | Overcast | 22° /12° | 0 mm | 6 | |
| 14 Sept. | Cloudy | 23° /12° | 0 mm | 6 | |
| 15 Sept. | Mist | 25° /10° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 26° /12° | 0 mm | 7 | |
| 17 Sept. | Light rain shower | 22° /12° | 1.6 mm | 5 | |
| 18 Sept. | Mist | 22° /9° | 0 mm | 5 | |
| 19 Sept. | Partly cloudy | 21° /10° | 0 mm | 5 | |
| 20 Sept. | Sunny | 23° /9° | 0 mm | 6 | |
| 21 Sept. | Mist | 24° /14° | 5.6 mm | 5 | |
| 22 Sept. | Mist | 23° /13° | 1 mm | 5 | |
| 23 Sept. | Mist | 20° /12° | 21.3 mm | 5 | |
| 24 Sept. | Mist | 21° /13° | 0 mm | 5 | |
| 25 Sept. | Overcast | 22° /13° | 9.7 mm | 5 | |
| 26 Sept. | Partly cloudy | 20° /12° | 0 mm | 5 | |
| 27 Sept. | Overcast | 18° /11° | 0 mm | 5 | |
| 28 Sept. | Overcast | 20° /11° | 0 mm | 5 | |
| 29 Sept. | Mist | 21° /14° | 0 mm | 5 | |
| 30 Sept. | Mist | 20° /12° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Simcoe County 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 Simcoe County forecast closer to your planned date for the most up-to-date weather information.
Simcoe County in September - FAQ
What are the expected maximum and minimum temperatures in Simcoe County during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Simcoe County during September?
Moderate rainfall is anticipated in Simcoe County during September, with a total of 85.8 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Simcoe County during September?
The average wind speed in Simcoe County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Simcoe County
Explore the daily rainfall trends and prepare for Simcoe Countys September weather 💧
UV exposure in Simcoe County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Simcoe County?Get accurate weather forecasts for Simcoe County, located at latitude 44.15 and longitude -79.866. Stay updated with localized weather information tailored for Simcoe County.
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