Williamsport (PA)
September
Weather in Williamsport, Pennsylvania for September 2027
Your guide to Williamsport weather in September - trends and predictions
In general, the average temperature in Williamsport at the beginning of September is 24.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.
Williamsport experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 221.4 mm.
Is September a good time to visit Williamsport? check out the best time to travel to Williamsport page.
✨ Is September a good time to visit Williamsport? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
23°/13°
Temperatures
10 km/h
Avg max wind
78 %
Avg humidity
Williamsport Weather September
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Temperatures trend during September in Williamsport
See the weather trend as well as the moving average line
September weather in Williamsport day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 28° /16° | 0.1 mm | 6 | |
| Sept. 2 |  Light rain | 24° /13° | 6.5 mm | 4 | |
| Sept. 3 |  Heavy rain | 25° /12° | 107 mm | 4 | |
| Sept. 4 | Light rain | 25° /14° | 4.5 mm | 5 | |
| Sept. 5 | Mist | 24° /14° | 0 mm | 6 | |
| Sept. 6 | Fog | 23° /13° | 0.1 mm | 6 | |
| Sept. 7 | Light rain | 20° /10° | 3 mm | 5 | |
| Sept. 8 | Fog | 21° /7° | 0 mm | 5 | |
| Sept. 9 |  Partly cloudy | 24° /10° | 0.5 mm | 5 | |
| Sept. 10 | Light rain | 25° /12° | 5.7 mm | 5 | |
| Sept. 11 | Mist | 25° /11° | 0 mm | 6 | |
| Sept. 12 | Mist | 25° /12° | 0.4 mm | 4 | |
| Sept. 13 | Light rain | 26° /14° | 6.2 mm | 4 | |
| Sept. 14 | Mist | 25° /13° | 0.1 mm | 6 | |
| Sept. 15 | Mist | 24° /12° | 0 mm | 6 | |
| Sept. 16 | Mist | 25° /13° | 0.1 mm | 5 | |
| Sept. 17 |  Patchy rain possible | 24° /14° | 2 mm | 4 | |
| Sept. 18 | Fog | 24° /15° | 0.5 mm | 5 | |
| Sept. 19 |  Overcast | 21° /13° | 0 mm | 4 | |
| Sept. 20 | Light rain | 22° /12° | 4.6 mm | 4 | |
| Sept. 21 | Heavy rain | 19° /13° | 31 mm | 3 | |
| Sept. 22 | Light rain | 19° /12° | 4.2 mm | 3 | |
| Sept. 23 |  Moderate rain | 18° /12° | 11.2 mm | 4 | |
| Sept. 24 | Moderate rain | 19° /12° | 14.7 mm | 4 | |
| Sept. 25 | Light rain | 20° /13° | 9.9 mm | 5 | |
| Sept. 26 | Light rain | 21° /13° | 3 mm | 4 | |
| Sept. 27 | Light rain | 19° /13° | 3.3 mm | 3 | |
| Sept. 28 | Light rain | 20° /15° | 3 mm | 4 | |
| Sept. 29 | Fog | 20° /13° | 0 mm | 3 | |
| Sept. 30 | Mist | 21° /13° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Williamsport 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 Williamsport forecast closer to your planned date for the most up-to-date weather information.
Change Month
Williamsport in September - FAQ
What are the expected maximum and minimum temperatures in Williamsport during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Williamsport during September?
Significant rainfall exceeding 221.4 mm is expected in Williamsport during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Williamsport during September?
The average wind speed in Williamsport during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Williamsport
Explore the daily rainfall trends and prepare for Williamsports September weather 💧
Typically, Williamsport has 8 rainy days in September with a total of 221.4 mm of rainfall.
UV exposure in Williamsport during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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