Grayson, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grayson, a community in Clinton County, Missouri.
Tonight
74°F
Partly Cloudy
Partly cloudy, with a low around 74. South wind 7 to 10 mph.
7-day forecast for Grayson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 74°F | Partly Cloudy | 7 to 10 mph S | 3% |
| Saturday | 92°F | Mostly Sunny | 8 to 12 mph SSW | 7% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 mph NW | 74% |
| Sunday | 78°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 43% |
| Sunday Night | 61°F | Showers And Thunderstorms Likely | 9 mph NNE | 55% |
| Monday | 69°F | Chance Rain Showers | 10 mph NNE | 52% |
| Monday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 10 mph NNE | 17% |
| Tuesday | 66°F | Mostly Cloudy | 9 mph NNE | 7% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 8 mph NE | 5% |
| Wednesday | 70°F | Mostly Sunny | 6 mph ENE | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 5 mph E | 6% |
| Thursday | 72°F | Slight Chance Rain Showers | 5 mph E | 16% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 5 mph E | 19% |
| Friday | 72°F | Slight Chance Rain Showers | 6 mph ESE | 20% |
Forecast source: National Weather Service (api.weather.gov) for Grayson (39.534, -94.562). Updated through the day.
Growing snapshot for Grayson
Last spring frost
Apr 18
First fall frost
Oct 20
Growing season
183 days
Hardiness zone
6a
More local growing data for Grayson: nearby ZIP 64492 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Smithville Lake, Mo (6.3 mi from Grayson). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.