Williamsport, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a town in Fountain County, Indiana.
Today
82°F
Patchy Fog then Sunny
Patchy fog before 10am. Sunny, with a high near 82. South southwest wind around 2 mph.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Patchy Fog then Sunny | 2 mph SSW | 0% |
| Tonight | 61°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 83°F | Mostly Sunny | 0 to 3 mph SSW | 0% |
| Wednesday Night | 66°F | Mostly Cloudy then Scattered Showers And Thunderstorms | 2 mph S | 49% |
| Thursday | 81°F | Showers And Thunderstorms | 1 to 5 mph S | 75% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 0 to 3 mph SSW | 64% |
| Friday | 82°F | Scattered Showers And Thunderstorms | 2 mph SSW | 26% |
| Friday Night | 65°F | Scattered Showers And Thunderstorms | 2 mph SW | 26% |
| Saturday | 83°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph SSW | 15% |
| Saturday Night | 68°F | Mostly Clear | 3 mph SSW | 12% |
| Sunday | 85°F | Mostly Sunny | 3 to 10 mph SSW | 9% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 6 to 9 mph SSW | 18% |
| Monday | 86°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 20% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 mph SSW | 32% |
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 Aug 4, 2026.