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
71°F
Partly Sunny
Partly sunny, with a high near 71. Southeast wind around 3 mph.
7-day forecast for South Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Partly Sunny | 3 mph SE | 1% |
| Tonight | 59°F | Rain Showers | 2 to 12 mph SE | 94% |
| Sunday | 70°F | Rain Showers | 5 to 12 mph S | 94% |
| Sunday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 6 to 12 mph N | 44% |
| Monday | 67°F | Mostly Cloudy | 9 mph N | 2% |
| Monday Night | 49°F | Chance Rain Showers | 8 mph NE | 39% |
| Tuesday | 61°F | Chance Rain Showers | 7 mph E | 41% |
| Tuesday Night | 47°F | Chance Rain Showers | 8 mph E | 35% |
| Wednesday | 61°F | Chance Rain Showers | 9 mph E | 35% |
| Wednesday Night | 47°F | Chance Rain Showers | 8 mph E | 33% |
| Thursday | 62°F | Chance Rain Showers | 7 mph NE | 37% |
| Thursday Night | 47°F | Chance Rain Showers | 7 mph NE | 37% |
| Friday | 66°F | Chance Rain Showers | 5 to 9 mph N | 25% |
| Friday Night | 48°F | Slight Chance Rain Showers | 9 mph N | 19% |
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 Sep 19, 2026.