Grain Valley, MO Weather & Growing Conditions
This Afternoon
70°F
Chance Rain Showers
A chance of rain showers. Partly sunny. High near 70, with temperatures falling to around 60 in the afternoon. Southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain Showers | 14 mph SW | 37% |
| Tonight | 45°F | Cloudy | 7 to 10 mph WNW | 12% |
| Wednesday | 57°F | Mostly Cloudy | 7 to 12 mph W | 4% |
| Wednesday Night | 39°F | Mostly Clear | 5 mph WSW | 2% |
| Thursday | 57°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 7 mph WNW | 15% |
| Thursday Night | 39°F | Mostly Cloudy | 5 mph NNW | 3% |
| Friday | 56°F | Partly Sunny | 6 mph N | 3% |
| Friday Night | 36°F | Mostly Cloudy | 2 mph N | 0% |
| Saturday | 58°F | Partly Sunny | 2 mph WNW | 4% |
| Saturday Night | 36°F | Mostly Clear | 1 mph W | 6% |
| Sunday | 64°F | Sunny | 1 to 5 mph W | 6% |
| Sunday Night | 38°F | Mostly Clear | 2 mph WSW | 0% |
| Monday | 67°F | Sunny | 2 to 8 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grain Valley, MO
Last spring frost
Apr 7
First fall frost
Oct 29
Growing season
202 days
Hardiness zone
6b
Explore more for Grain Valley, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Lees Summit Muni Ap, Mo (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.