South Williamsport, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Williamsport, a borough in Lycoming County, Pennsylvania.
Today
84°F
Patchy Fog then Sunny
Patchy fog before 10am. Sunny, with a high near 84. South wind 0 to 3 mph.
7-day forecast for South Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 0 to 3 mph S | 0% |
| Tonight | 63°F | Partly Cloudy then Patchy Fog | 0 to 3 mph NE | 0% |
| Wednesday | 84°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 6 mph E | 27% |
| Wednesday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 42% |
| Thursday | 87°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 84% |
| Thursday Night | 70°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 mph W | 84% |
| Friday | 87°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 74% |
| Friday Night | 68°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 3 mph NW | 74% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 6 mph W | 43% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 to 3 mph NW | 43% |
| Sunday | 88°F | Mostly Sunny | 0 to 6 mph W | 11% |
| Sunday Night | 69°F | Partly Cloudy | 0 to 5 mph SW | 11% |
| Monday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 9 mph W | 28% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 1 to 8 mph W | 28% |
Forecast source: National Weather Service (api.weather.gov) for South Williamsport (41.229, -77.000). Updated through the day.
Growing snapshot for South Williamsport
Last spring frost
Apr 25
First fall frost
Oct 24
Growing season
181 days
Hardiness zone
6b
More local growing data for South Williamsport: nearby ZIP 17702 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Duboistown
Faxon
Garden View
Hughesville
Jersey Shore
Kenmar
Montgomery
Montoursville
Muncy
Oval
Picture Rocks
Rauchtown
Salladasburg
Williamsport
Climate data from the nearest NOAA station, Williamsport 2, Pa (6.6 mi from South Williamsport). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.