South Williamsport, PA Weather Forecast
Local 7-day forecast
Areas Of Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for South Williamsport, PA in one place.
Areas of fog before 11am. Mostly sunny, with a high near 79. South wind 1 to 12 mph.
Local Weather Overview
This forecast page for South Williamsport, PA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 13, 2026 8:54 AM EDT.
The active forecast window currently covers Oct 13 to Oct 19, 2026 for South Williamsport, PA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 19, 2026
- Latest sync
- Oct 13, 2026 8:54 AM EDT
- Forecast office
- CTP
- Source
- NOAA / NWS
Daily Outlook
This Week in South Williamsport
Today looks like the warmest upcoming period in South Williamsport at 79 degrees F.
Saturday Night is the coolest period ahead with temperatures near 33 degrees F.
The strongest winds are forecast for Friday Night at about 20 to 23 mph NW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 13, 2026 8:54 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- CTP
- Radar station
- KCCX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 63. Southwest wind around 7 mph.
A chance of rain showers between 8am and 2pm. Partly sunny, with a high near 76. West wind 3 to 8 mph. Chance of precipitation is 30%.
Mostly cloudy, with a low around 51. Northwest wind 6 to 9 mph.
Mostly sunny, with a high near 64. Northeast wind 2 to 8 mph.
A chance of rain showers between 8pm and 2am, then showers and thunderstorms. Mostly cloudy, with a low around 53. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 67. Chance of precipitation is 90%.
A chance of rain showers before 8pm. Mostly cloudy, with a low around 37. Chance of precipitation is 30%.
Mostly sunny, with a high near 50.
Areas of frost after midnight. Mostly clear, with a low around 33.
Widespread frost before 10am. Sunny, with a high near 57.
Areas of frost after 3am. Mostly clear, with a low around 34.
Areas of frost before 9am. Mostly sunny, with a high near 62.
Mostly cloudy, with a low around 40.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 13
|
Areas Of Fog then Mostly Sunny
|
79°F |
1 to 12 mph
S
|
|
Tonight
Oct 13
|
Mostly Clear
|
63°F |
7 mph
SW
|
|
Wednesday
Oct 14
|
Chance Rain Showers
|
76°F |
3 to 8 mph
W
|
|
Wednesday Night
Oct 14
|
Mostly Cloudy
|
51°F |
6 to 9 mph
NW
|
|
Thursday
Oct 15
|
Mostly Sunny
|
64°F |
2 to 8 mph
NE
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms
|
53°F |
1 to 12 mph
SE
|
|
Friday
Oct 16
|
Showers And Thunderstorms
|
67°F |
9 to 21 mph
SW
|
|
Friday Night
Oct 16
|
Chance Rain Showers then Mostly Cloudy
|
37°F |
20 to 23 mph
NW
|
|
Saturday
Oct 17
|
Mostly Sunny
|
50°F |
18 to 23 mph
NW
|
|
Saturday Night
Oct 17
|
Mostly Clear then Areas Of Frost
|
33°F |
5 to 16 mph
NW
|
|
Sunday
Oct 18
|
Widespread Frost then Sunny
|
57°F |
3 to 7 mph
W
|
|
Sunday Night
Oct 18
|
Mostly Clear then Areas Of Frost
|
34°F |
0 to 5 mph
S
|
|
Monday
Oct 19
|
Areas Of Frost then Mostly Sunny
|
62°F |
0 to 7 mph
SE
|
|
Monday Night
Oct 19
|
Mostly Cloudy
|
40°F |
0 to 5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around South Williamsport.
