Lancaster County (Lancaster)
September
Weather in Lancaster County, Pennsylvania for September 2026
Your guide to Lancaster County weather in September - trends and predictions
So far, September 2026 in Lancaster County shows a warmer trend than usual by 2.5 °F.
The forecast for the next days in Lancaster County predicts temperatures to be around 20 °F, close to the historical average.
In general, the average temperature in Lancaster County at the beginning of September is 26.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.4 °F by the end of September.
Lancaster County in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 111 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
24°/14°
Temperatures
15 km/h
Avg max wind
77 %
Avg humidity
Lancaster County Weather September
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Temperatures trend during September in Lancaster County
See the weather trend as well as the moving average line
September weather in Lancaster County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate rain at times | 29° /18° | 0.4 mm | 7 | |
| Sept. 2 |  Cloudy | 24° /15° | 59.8 mm | 4 | |
| Sept. 3 |  Sunny | 26° /15° | 3.8 mm | 4 | |
| Sept. 4 |  Overcast | 28° /15° | 9.7 mm | 6 | |
| Sept. 5 | Sunny | 27° /16° | 3.8 mm | 6 | |
| Sept. 6 | Overcast | 28° /15° | 1 mm | 7 | |
| Sept. 7 | Moderate or heavy rain shower | 24° /12° | 1.4 mm | 6 | |
| Sept. 8 | Sunny | 24° /9° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 27° /12° | 0.1 mm | 5 | |
| Sept. 10 | Overcast | 26° /14° | 0 mm | 5 | |
| Sept. 11 | Sunny | 27° /14° | 0.4 mm | 6 | |
| Sept. 12 | Sunny | 26° /13° | 0.9 mm | 5 | |
| Sept. 13 | Overcast | 26° /15° | 4.6 mm | 5 | |
| Sept. 14 | Partly cloudy | 27° /14° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 25° /12° | 1.6 mm | 6 | |
| Sept. 16 | Overcast | 26° /12° | 0 mm | 6 | |
| Sept. 17 | Overcast | 22° /15° | 7.2 mm | 5 | |
| Sept. 18 | Moderate or heavy rain shower | 24° /16° | 2.9 mm | 6 | |
| Sept. 19 | Sunny | 21° /14° | 0 mm | 7 | |
| Sept. 20 | Overcast | 23° /16° | 2.2 mm | 1.7 | |
| Sept. 21 |  Light rain shower | 19° /12° | 16.3 mm | 2.5 | |
| Sept. 22 | Light rain shower | 13° /11° | 38.4 mm | 3 | |
| Sept. 23 | Overcast | 14° /10° | 0.5 mm | 3 | |
| Sept. 24 | Patchy rain possible | 14° /11° | 5 mm | 3 | |
| Sept. 25 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 26 | Sunny | 20° /9° | 0 mm | 5 | |
| Sept. 27 | Sunny | 19° /7° | 0 mm | 5 | |
| Sept. 28 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 29 | Overcast | 23° /12° | 0 mm | 5 | |
| Sept. 30 | Overcast | 23° /16° | 0 mm | 5 | |
| Next | |||||
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.
Change Month
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 24° 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?
Significant rainfall exceeding 111 mm is expected in Lancaster County during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Lancaster County during September?
The average wind speed in Lancaster County during September is 15 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 💧
Typically, Lancaster County has 16 rainy days in September with a total of 111 mm of rainfall.
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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