Williamstown, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamstown, a community in Berkshire County, Massachusetts.
Tonight
44°F
Mostly Cloudy
Mostly cloudy, with a low around 44. Northwest wind 0 to 7 mph.
7-day forecast for Williamstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Mostly Cloudy | 0 to 7 mph NW | 0% |
| Saturday | 68°F | Mostly Sunny | 0 mph | 0% |
| Saturday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 3 mph NE | 17% |
| Sunday | 62°F | Rain Showers | 6 mph SE | 95% |
| Sunday Night | 48°F | Rain Showers | 2 mph NE | 95% |
| Monday | 66°F | Mostly Sunny | 5 mph N | 12% |
| Monday Night | 44°F | Mostly Cloudy | 3 mph NE | 4% |
| Tuesday | 63°F | Mostly Cloudy | 5 mph E | 7% |
| Tuesday Night | 43°F | Mostly Cloudy | 2 to 6 mph E | 5% |
| Wednesday | 62°F | Partly Sunny | 6 to 9 mph E | 8% |
| Wednesday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph E | 22% |
| Thursday | 61°F | Chance Rain Showers | 6 mph NE | 28% |
| Thursday Night | 45°F | Chance Rain Showers | 5 mph NE | 33% |
| Friday | 67°F | Slight Chance Rain Showers | 2 to 6 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov) for Williamstown (42.709, -73.201). Updated through the day.
Growing snapshot for Williamstown
Last spring frost
May 10
First fall frost
Oct 4
Growing season
147 days
Hardiness zone
5b
More local growing data for Williamstown: nearby ZIP 01267 weather · frost dates · planting calendar · Massachusetts frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, North Adams Harriman Ap, Ma (4.2 mi from Williamstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.