Delaware County (Glen Mills)
September
Weather in Delaware County, Pennsylvania for September 2026
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 24.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 22.9 °C by the end of September.
The climate of Delaware County in September is notably wet, with an average of 13 rainy days, and a total of 247.5 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
13
Rainy days
0
Snow days
24°/16°
Temperatures
14 km/h
Avg max wind
73 %
Avg humidity
Delaware County Weather September
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Temperatures trend during September in Delaware County
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September weather in Delaware County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 25° /18° | 1.5 mm | 6 | |
| Sept. 2 |  Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 3 |  Sunny | 22° /12° | 0 mm | 6 | |
| Sept. 4 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 5 |  Partly cloudy | 29° /16° | 22.3 mm | 7 | |
| Sept. 6 | Light rain shower | 26° /18° | 6.6 mm | 6 | |
| Sept. 7 |  Fog | 20° /13° | 41.3 mm | 5 | |
| Sept. 8 | Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 9 | Sunny | 23° /12° | 0 mm | 6 | |
| Sept. 10 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 11 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 12 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 26° /15° | 1.4 mm | 7 | |
| Sept. 14 | Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 27° /17° | 0 mm | 7 | |
| Sept. 16 | Overcast | 25° /14° | 0 mm | 6 | |
| Sept. 17 | Overcast | 20° /15° | 0 mm | 5 | |
| Sept. 18 | Mist | 24° /17° | 0 mm | 6 | |
| Sept. 19 |  Heavy rain | 25° /16° | 78.3 mm | 6 | |
| Sept. 20 | Overcast | 21° /17° | 0 mm | 5 | |
| Sept. 21 |  Moderate or heavy rain shower | 23° /16° | 22.3 mm | 5 | |
| Sept. 22 |  Thundery outbreaks possible | 22° /16° | 0 mm | 5 | |
| Sept. 23 | Overcast | 25° /16° | 2.4 mm | 6 | |
| Sept. 24 | Moderate or heavy rain shower | 23° /17° | 12.7 mm | 5 | |
| Sept. 25 | Moderate or heavy rain shower | 22° /18° | 38.6 mm | 5 | |
| Sept. 26 | Fog | 26° /19° | 2.8 mm | 6 | |
| Sept. 27 | Fog | 25° /17° | 0 mm | 6 | |
| Sept. 28 | Light rain shower | 21° /17° | 14.1 mm | 5 | |
| Sept. 29 | Overcast | 22° /16° | 0 mm | 5 | |
| Sept. 30 |  Light rain | 21° /15° | 3.3 mm | 5 | |
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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 247.5 mm is expected in Delaware County during September, occurring over more than 13 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 14 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 13 rainy days in September with a total of 247.5 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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