Williamsport, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a town in Fountain County, Indiana.
This Afternoon
66°F
Mostly Cloudy
Mostly cloudy. High near 66, with temperatures falling to around 59 in the afternoon. West southwest wind around 10 mph, with gusts as high as 18 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Cloudy | 10 mph WSW | 7% |
| Tonight | 47°F | Cloudy | 6 to 9 mph SW | 6% |
| Thursday | 59°F | Mostly Cloudy | 8 to 13 mph SW | 8% |
| Thursday Night | 42°F | Chance Light Rain | 2 to 7 mph WNW | 46% |
| Friday | 52°F | Mostly Cloudy | 7 to 10 mph NNW | 11% |
| Friday Night | 33°F | Partly Cloudy | 3 to 8 mph NNW | 3% |
| Saturday | 53°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 29°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 58°F | Sunny | 0 to 7 mph W | 0% |
| Sunday Night | 32°F | Mostly Clear | 0 to 3 mph WNW | 0% |
| Monday | 62°F | Sunny | 0 to 6 mph W | 0% |
| Monday Night | 37°F | Clear | 5 mph SW | 0% |
| Tuesday | 64°F | Sunny | 5 mph W | 1% |
| Tuesday Night | 36°F | Mostly Clear | 2 mph NNW | 1% |
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 Nov 5, 2026.