Lycoming County (Williamsport)
September
Weather in Lycoming County, Pennsylvania for September 2026
Your guide to Lycoming County weather in September - trends and predictions
So far, September 2026 in Lycoming County is slightly warmer than the historical average by 1.3 °F.
The forecast for the upcoming days in Lycoming County predicts a temperature of 16.9 °F, which is slightly above the historical average.
In general, the average temperature in Lycoming County at the beginning of September is 24.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.3 °F by the end of September.
Lycoming County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 120.8 mm.
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Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
22°/12°
Temperatures
10 km/h
Avg max wind
78 %
Avg humidity
Lycoming County Weather September
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Temperatures trend during September in Lycoming County
See the weather trend as well as the moving average line
September weather in Lycoming County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 28° /15° | 0.1 mm | 6 | |
| Sept. 2 | Mist | 24° /13° | 6.5 mm | 4 | |
| Sept. 3 |  Sunny | 25° /11° | 107 mm | 4 | |
| Sept. 4 | Sunny | 25° /14° | 4.5 mm | 5 | |
| Sept. 5 | Mist | 24° /13° | 0 mm | 6 | |
| Sept. 6 | Fog | 24° /13° | 0.1 mm | 6 | |
| Sept. 7 |  Moderate rain | 20° /10° | 3 mm | 5 | |
| Sept. 8 | Fog | 21° /7° | 0 mm | 5 | |
| Sept. 9 |  Partly cloudy | 25° /9° | 0.5 mm | 5 | |
| Sept. 10 | Partly cloudy | 25° /12° | 5.7 mm | 5 | |
| Sept. 11 | Mist | 25° /11° | 0 mm | 6 | |
| Sept. 12 | Mist | 25° /11° | 0.4 mm | 4 | |
| Sept. 13 | Mist | 26° /13° | 6.2 mm | 4 | |
| Sept. 14 | Mist | 25° /13° | 0.1 mm | 6 | |
| Sept. 15 | Mist | 25° /11° | 0 mm | 6 | |
| Sept. 16 | Mist | 25° /13° | 0.1 mm | 5 | |
| Sept. 17 |  Cloudy | 24° /14° | 2 mm | 4 | |
| Sept. 18 | Fog | 25° /14° | 0.5 mm | 5 | |
| Sept. 19 |  Overcast | 22° /13° | 0 mm | 4 | |
| Sept. 20 | Fog | 23° /12° | 4.6 mm | 4 | |
| Sept. 21 | Overcast | 20° /12° | 3.4 mm | 2.6 | |
| Sept. 22 |  Light rain shower | 12° /9° | 20.8 mm | 0.5 | |
| Sept. 23 | Overcast | 12° /8° | 0.6 mm | 5.2 | |
| Sept. 24 | Overcast | 17° /9° | 0.1 mm | 5.2 | |
| Sept. 25 | Overcast | 18° /5° | 0 mm | 4 | |
| Sept. 26 | Overcast | 18° /7° | 0 mm | 4 | |
| Sept. 27 | Sunny | 17° /7° | 0 mm | 5 | |
| Sept. 28 | Overcast | 14° /5° | 0 mm | 3 | |
| Sept. 29 | Fog | 13° /11° | 6.1 mm | 3 | |
| Sept. 30 | Light rain shower | 17° /13° | 4.2 mm | 4 | |
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Important Notice
Our weather forecast for Lycoming 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 Lycoming County forecast closer to your planned date for the most up-to-date weather information.
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Lycoming County in September - FAQ
What are the expected maximum and minimum temperatures in Lycoming County during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lycoming County during September?
Significant rainfall exceeding 120.8 mm is expected in Lycoming 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 Lycoming County during September?
The average wind speed in Lycoming County during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Lycoming County
Explore the daily rainfall trends and prepare for Lycoming Countys September weather 💧
Typically, Lycoming County has 10 rainy days in September with a total of 120.8 mm of rainfall.
UV exposure in Lycoming County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Lycoming County?Get accurate weather forecasts for Lycoming County, located at latitude 41.241 and longitude -77.001. Stay updated with localized weather information tailored for Lycoming County.
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