Weather in Lancaster County, Pennsylvania for September 2025
Until now, September 2025 in Lancaster County has been nearly identical to the historical average, with a temperature of 24.4 °F (showing only a slight deviation of 0 °F).
The forecast for the next days in Lancaster County predicts temperatures to be around 24 °F, close to the historical average.
In general, the average temperature in Lancaster County at the beginning of September is 24.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 22 °F by the end of September.
The climate of Lancaster County in September is notably wet, with an average of 14 rainy days, and a total of 73.7 mm of precipitation.
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Lancaster County Weather September
Temperatures trend during September in Lancaster County
September weather in Lancaster County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 25° /16° | 0.6 mm | 6 | |
| Sept. 2 |  Cloudy | 23° /13° | 0 mm | 6 | |
| Sept. 3 |  Sunny | 22° /12° | 0 mm | 6 | |
| Sept. 4 |  Overcast | 26° /12° | 12.2 mm | 6 | |
| Sept. 5 | Sunny | 26° /14° | 5.8 mm | 6 | |
| Sept. 6 | Overcast | 27° /15° | 1.5 mm | 6 | |
| Sept. 7 | Moderate or heavy rain shower | 21° /12° | 2.1 mm | 5 | |
| Sept. 8 | Sunny | 21° /9° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 24° /10° | 0 mm | 6 | |
| Sept. 10 | Sunny | 24° /10° | 0 mm | 6 | |
| Sept. 11 | Sunny | 26° /12° | 0 mm | 7 | |
| Sept. 12 | Sunny | 26° /12° | 0 mm | 6 | |
| Sept. 13 | Overcast | 26° /14° | 0 mm | 6 | |
| Sept. 14 | Partly cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 26° /14° | 0 mm | 1.3 | |
| Sept. 16 | Overcast | 22° /14° | 0 mm | 1.3 | |
| Sept. 17 |  Patchy rain possible | 18° /13° | 3.6 mm | 0.4 | |
| Sept. 18 | Overcast | 27° /16° | 0 mm | 1.5 | |
| Sept. 19 | Sunny | 30° /15° | 0 mm | 0 | |
| Sept. 20 | Sunny | 25° /14° | 0 mm | 5 | |
| Sept. 21 | Sunny | 24° /11° | 0 mm | 5 | |
| Sept. 22 | Sunny | 25° /11° | 0 mm | 5 | |
| Sept. 23 | Sunny | 26° /13° | 0 mm | 5 | |
| Sept. 24 |  Moderate rain | 23° /15° | 7.9 mm | 4 | |
| Sept. 25 | Patchy rain possible | 25° /16° | 0.1 mm | 4 | |
| Sept. 26 | Patchy rain possible | 27° /16° | 4.3 mm | 4 | |
| Sept. 27 | Moderate rain | 21° /15° | 8.2 mm | 4 | |
| Sept. 28 | Partly cloudy | 22° /14° | 0 mm | 5 | |
| Sept. 29 |  Heavy rain at times | 18° /16° | 2.9 mm | 4 | |
| Sept. 30 | Moderate rain | 18° /14° | 17 mm | 4 | |
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Lancaster County in September - FAQ
September rainfall patterns in Lancaster County
UV exposure in Lancaster County during September
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Where is Lancaster County?Get accurate weather forecasts for Lancaster County, located at latitude 40.038 and longitude -76.306. Stay updated with localized weather information tailored for Lancaster County.