Williamstown, MO Weather & Growing Conditions
Today
90°F
Mostly Cloudy
Mostly cloudy, with a high near 90. Southwest wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Mostly Cloudy | 8 mph SW | 6% |
| Tonight | 69°F | Chance Showers And Thunderstorms | 3 mph W | 58% |
| Sunday | 77°F | Chance Showers And Thunderstorms | 3 to 9 mph N | 53% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 68% |
| Monday | 66°F | Showers And Thunderstorms Likely | 10 mph NE | 68% |
| Monday Night | 55°F | Chance Rain Showers | 9 mph NE | 32% |
| Tuesday | 64°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 32% |
| Tuesday Night | 50°F | Partly Cloudy | 3 to 7 mph NE | 4% |
| Wednesday | 67°F | Mostly Sunny | 6 mph N | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 3 mph NE | 2% |
| Thursday | 71°F | Partly Sunny | 5 mph NE | 5% |
| Thursday Night | 57°F | Mostly Cloudy | 3 mph NE | 4% |
| Friday | 73°F | Partly Sunny | 2 to 6 mph E | 8% |
| Friday Night | 57°F | Mostly Cloudy | 5 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Williamstown, MO
Last spring frost
Apr 11
First fall frost
Oct 23
Growing season
194 days
Hardiness zone
6a
Explore more for Williamstown, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Canton L&D 20, Mo (15.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.