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Williamsport (PA)
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Williamsport (PA)
Winston-Salem (NC) More Locations
United States weather

Weather in Williamsport, Pennsylvania for September 2025

Your guide to Williamsport weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Williamsport is slightly cooler than the historical average by -0.7 °F.

  • The forecast for the upcoming days in Williamsport predicts a temperature of 25.6 °F, which is slightly above the historical average.

  • In general, the average temperature in Williamsport at the beginning of September is 22.7 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 24 °F by the end of September.

    • Rain 🌧️

  • Williamsport experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 175 mm.

    • More

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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Williamsport Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Fog
26°
2
Mist
22°
3
Sunny
22°
4
Sunny
24°
5
Mist
24°
6
Fog
23°
7
Moderate rain
18°
8
Fog
20°
9
Partly cloudy
23°
10
Partly cloudy
23°
11
Mist
24°
12
Mist
25°
13
Mist
25°
14
Mist
28°
15
Mist
26°
16
Cloudy
22°
17
Overcast
21°
18
Sunny
29°
19
Sunny
28°
20
Sunny
21°
21
Sunny
22°
22
Sunny
25°
23
Patchy rain possible
28°
24
Partly cloudy
27°
25
Mist
25°
26
Sunny
25°
27
Sunny
29°
28
Sunny
30°
29
Fog
17°
30
Mist
15°

Temperatures trend during September in Williamsport

See the weather trend as well as the moving average line

September weather in Williamsport day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Fog
Fog
 26° /14° 0.1 mm 6
Sept. 2 Mist
Mist
 22° /10° 0 mm 5
Sept. 3 Sunny
Sunny
 22° /8° 0 mm 6
Sept. 4 Sunny
Sunny
 24° /11° 6.4 mm 6
Sept. 5 Mist
Mist
 24° /11° 0 mm 5
Sept. 6 Fog
Fog
 23° /12° 0.2 mm 5
Sept. 7 Moderate rain
Moderate rain
 18° /10° 4.6 mm 4
Sept. 8 Fog
Fog
 20° /5° 0 mm 5
Sept. 9 Partly cloudy
Partly cloudy
 23° /6° 0 mm 6
Sept. 10 Partly cloudy
Partly cloudy
 23° /8° 0 mm 6
Sept. 11 Mist
Mist
 24° /8° 0 mm 6
Sept. 12 Mist
Mist
 25° /11° 0 mm 6
Sept. 13 Mist
Mist
 25° /11° 0 mm 6
Sept. 14 Mist
Mist
 28° /13° 0 mm 6
Sept. 15 Mist
Mist
 26° /13° 0 mm 1.4
Sept. 16 Cloudy
Cloudy
 22° /14° 0 mm 1.4
Sept. 17 Overcast
Overcast
 21° /14° 0 mm 1.1
Sept. 18 Sunny
Sunny
 29° /11° 0 mm 1.4
Sept. 19 Sunny
Sunny
 28° /12° 0 mm 0
Sept. 20 Sunny
Sunny
 21° /6° 0 mm 4
Sept. 21 Sunny
Sunny
 22° /5° 0 mm 4
Sept. 22 Sunny
Sunny
 25° /7° 0 mm 5
Sept. 23 Patchy rain possible
Patchy rain possible
 28° /10° 0.2 mm 4
Sept. 24 Partly cloudy
Partly cloudy
 27° /14° 0 mm 5
Sept. 25 Mist
Mist
 25° /12° 0 mm 4
Sept. 26 Sunny
Sunny
 25° /11° 0 mm 5
Sept. 27 Sunny
Sunny
 29° /12° 0 mm 5
Sept. 28 Sunny
Sunny
 30° /16° 0 mm 6
Sept. 29 Fog
Fog
 17° /15° 0 mm 4
Sept. 30 Mist
Mist
 15° /14° 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.
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Williamsport in September - FAQ

What are the expected maximum and minimum temperatures in Williamsport 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 Williamsport during September?
Significant rainfall exceeding 175 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 💧

UV exposure in Williamsport during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Williamsport?

Get accurate weather forecasts for Williamsport, located at latitude 41.241 and longitude -77.001. Stay updated with localized weather information tailored for Williamsport.

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