Williamsport, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a town in Fountain County, Indiana.
Overnight
65°F
Partly Cloudy
Partly cloudy. Low around 65, with temperatures rising to around 67 overnight. East southeast wind around 6 mph.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Partly Cloudy | 6 mph ESE | 12% |
| Saturday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph SE | 64% |
| Saturday Night | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 27% |
| Sunday | 79°F | Showers And Thunderstorms Likely | 1 to 8 mph NNE | 68% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 67% |
| Monday | 68°F | Showers And Thunderstorms Likely | 14 mph ENE | 61% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 14 mph NE | 43% |
| Tuesday | 67°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 13 mph NE | 21% |
| Tuesday Night | 53°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 12 mph NNE | 21% |
| Wednesday | 68°F | Partly Sunny | 9 mph NNE | 8% |
| Wednesday Night | 53°F | Mostly Cloudy | 3 to 9 mph NNE | 8% |
| Thursday | 70°F | Partly Sunny | 5 to 8 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 2 to 8 mph NNE | 3% |
| Friday | 73°F | Mostly Sunny | 3 to 8 mph NNE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Williamsport (40.288, -87.292). Updated through the day.
Growing snapshot for Williamsport
Last spring frost
Apr 22
First fall frost
Oct 17
Growing season
176 days
Hardiness zone
6a
More local growing data for Williamsport: nearby ZIP 47918 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Attica
Cates
Covington
Foster
Hillsboro
Independence
Kingman
Kramer
Lake Holiday Hideaway
Mellott
Newtown
Rob Roy
Stone Bluff
Veedersburg
Wallace
Climate data from the nearest NOAA station, Attica 2E, In (1.2 mi from Williamsport). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.