Williamstown, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamstown, a city in Grant County, Kentucky.
Tonight
61°F
Mostly Cloudy then Showers And Thunderstorms
A chance of rain showers between 1am and 4am, then showers and thunderstorms. Mostly cloudy, with a low around 61. Southeast wind 7 to 12 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Williamstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Mostly Cloudy then Showers And Thunderstorms | 7 to 12 mph SE | 91% |
| Wednesday | 68°F | Showers And Thunderstorms | 8 to 13 mph S | 100% |
| Wednesday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 7 mph SW | 32% |
| Thursday | 67°F | Mostly Sunny | 5 to 9 mph SW | 0% |
| Thursday Night | 46°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 63°F | Partly Sunny | 2 to 7 mph W | 6% |
| Friday Night | 42°F | Mostly Cloudy | 6 mph NW | 13% |
| Saturday | 56°F | Mostly Sunny | 6 mph NW | 11% |
| Saturday Night | 37°F | Partly Cloudy | 3 mph NW | 7% |
| Sunday | 58°F | Mostly Sunny | 2 to 6 mph W | 7% |
| Sunday Night | 36°F | Partly Cloudy | 5 mph W | 14% |
| Monday | 60°F | Sunny | 7 mph W | 14% |
| Monday Night | 39°F | Mostly Clear | 7 mph SW | 8% |
| Tuesday | 64°F | Sunny | 8 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Williamstown (38.640, -84.573). Updated through the day.
Growing snapshot for Williamstown
Last spring frost
Apr 11
First fall frost
Oct 29
Growing season
199 days
Hardiness zone
6b
More local growing data for Williamstown: nearby ZIP 41097 weather · frost dates · planting calendar · Kentucky frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Williamstown, Ky (1.8 mi from Williamstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.