Lancaster County (Lancaster)
September
Weather in Lancaster County, Pennsylvania for September 2025
Your guide to Lancaster County weather in September - trends and predictions
In general, the average temperature in Lancaster County at the beginning of September is 23.1 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 20.7 °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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Temperatures
Rain 🌧️
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16
Dry days
14
Rainy days
0
Snow days
23°/14°
Temperatures
16 km/h
Avg max wind
77 %
Avg humidity
Lancaster County Weather September
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Temperatures trend during September in Lancaster County
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September weather in Lancaster County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 27° /20° | 1.3 mm | 6 | |
| Sept. 2 |  Cloudy | 22° /14° | 0 mm | 5 | |
| Sept. 3 |  Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 4 |  Overcast | 23° /10° | 0 mm | 5 | |
| Sept. 5 | Sunny | 24° /10° | 0 mm | 6 | |
| Sept. 6 | Overcast | 24° /12° | 0 mm | 5 | |
| Sept. 7 | Moderate or heavy rain shower | 20° /12° | 4.2 mm | 5 | |
| Sept. 8 | Sunny | 20° /9° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 24° /10° | 0 mm | 6 | |
| Sept. 10 | Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 11 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 12 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 13 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 14 | Partly cloudy | 28° /15° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 16 | Overcast | 24° /11° | 0 mm | 5 | |
| Sept. 17 | Overcast | 23° /16° | 0 mm | 5 | |
| Sept. 18 | Moderate or heavy rain shower | 23° /16° | 5.8 mm | 5 | |
| Sept. 19 |  Heavy rain at times | 24° /15° | 1 mm | 5 | |
| Sept. 20 | Cloudy | 25° /15° | 0 mm | 6 | |
| Sept. 21 |  Patchy rain possible | 24° /16° | 11.2 mm | 5 | |
| Sept. 22 | Moderate or heavy rain shower | 21° /17° | 5.5 mm | 5 | |
| Sept. 23 | Heavy rain at times | 19° /14° | 3.8 mm | 4 | |
| Sept. 24 | Moderate rain at times | 19° /14° | 6.4 mm | 4 | |
| Sept. 25 | Moderate or heavy rain shower | 20° /17° | 4.2 mm | 5 | |
| Sept. 26 | Moderate rain at times | 26° /20° | 1.6 mm | 6 | |
| Sept. 27 | Heavy rain at times | 23° /19° | 6.4 mm | 5 | |
| Sept. 28 | Moderate rain at times | 21° /17° | 2.4 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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Important Notice
Our weather forecast for Lancaster 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 Lancaster County forecast closer to your planned date for the most up-to-date weather information.
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Lancaster County in September - FAQ
What are the expected maximum and minimum temperatures in Lancaster County during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lancaster County during September?
Moderate rainfall is anticipated in Lancaster County during September, with a total of 73.7 mm spread over approximately 14 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Lancaster County during September?
The average wind speed in Lancaster County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Lancaster County
Explore the daily rainfall trends and prepare for Lancaster Countys September weather 💧
UV exposure in Lancaster County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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