Delaware County (Glen Mills)
September
Weather in Delaware County, Pennsylvania for September 2027
Your guide to Delaware County weather in September - trends and predictions
In general, the average temperature in Delaware County at the beginning of September is 26.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °C by the end of September.
Delaware County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 218 mm.
Is September a good time to visit Delaware County? check out the best time to travel to Delaware County page.
✨ Is September a good time to visit Delaware County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
24°/16°
Temperatures
15 km/h
Avg max wind
73 %
Avg humidity
Delaware County Weather September
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Temperatures trend during September in Delaware County
See the weather trend as well as the moving average line
September weather in Delaware County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 29° /19° | 1 mm | 6 | |
| Sept. 2 | Patchy rain possible | 24° /17° | 1.3 mm | 4 | |
| Sept. 3 |  Light rain | 25° /15° | 8.1 mm | 4 | |
| Sept. 4 |  Overcast | 27° /16° | 0.5 mm | 6 | |
| Sept. 5 |  Moderate rain | 28° /17° | 16.6 mm | 6 | |
| Sept. 6 | Light rain | 26° /18° | 4.4 mm | 7 | |
| Sept. 7 |  Heavy rain | 23° /14° | 27.5 mm | 6 | |
| Sept. 8 |  Sunny | 24° /12° | 0 mm | 7 | |
| Sept. 9 | Overcast | 25° /14° | 0 mm | 5 | |
| Sept. 10 | Overcast | 26° /17° | 0 mm | 5 | |
| Sept. 11 | Sunny | 27° /16° | 0.3 mm | 5 | |
| Sept. 12 | Sunny | 26° /15° | 0 mm | 6 | |
| Sept. 13 | Light rain | 26° /17° | 5.2 mm | 5 | |
| Sept. 14 |  Partly cloudy | 26° /17° | 0.1 mm | 7 | |
| Sept. 15 | Partly cloudy | 25° /16° | 0 mm | 7 | |
| Sept. 16 | Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 17 | Light rain | 23° /17° | 3 mm | 4 | |
| Sept. 18 |  Mist | 24° /18° | 0.2 mm | 5 | |
| Sept. 19 | Heavy rain | 24° /16° | 52.2 mm | 5 | |
| Sept. 20 | Light rain | 21° /17° | 7.9 mm | 4 | |
| Sept. 21 | Moderate rain | 23° /16° | 15.6 mm | 4 | |
| Sept. 22 |  Thundery outbreaks possible | 20° /15° | 3.8 mm | 4 | |
| Sept. 23 | Patchy rain possible | 23° /14° | 2 mm | 4 | |
| Sept. 24 |  Moderate or heavy rain shower | 21° /15° | 8.5 mm | 4 | |
| Sept. 25 | Heavy rain | 21° /15° | 25.7 mm | 4 | |
| Sept. 26 | Light rain | 23° /17° | 5.9 mm | 4 | |
| Sept. 27 | Moderate rain | 22° /16° | 15.1 mm | 4 | |
| Sept. 28 | Moderate rain | 19° /16° | 10.7 mm | 4 | |
| Sept. 29 | Overcast | 21° /16° | 0 mm | 4 | |
| Sept. 30 | Light rain | 22° /16° | 2.3 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Delaware 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 Delaware County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Delaware County in September - FAQ
What are the expected maximum and minimum temperatures in Delaware County during September?
During September, expect a variety of temperatures with highs around 24° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Delaware County during September?
Significant rainfall exceeding 218 mm is expected in Delaware County during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Delaware County during September?
The average wind speed in Delaware County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Delaware County
Explore the daily rainfall trends and prepare for Delaware Countys September weather 💧
Typically, Delaware County has 10 rainy days in September with a total of 218 mm of rainfall.
UV exposure in Delaware County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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