Grain Valley, MO Weather Forecast
Local 7-day forecast
Mostly Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Grain Valley, MO in one place.
A slight chance of rain showers between 1pm and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Heat index values as high as 96. South southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Grain Valley, MO is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 12, 2026 3:08 AM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Grain Valley, MO.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 3:08 AM CDT
- Forecast office
- EAX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grain Valley
Tuesday looks like the warmest upcoming period in Grain Valley at 90 degrees F.
Friday Night is the coolest period ahead with temperatures near 39 degrees F.
The strongest winds are forecast for Friday at about 12 to 16 mph NNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 3:08 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- EAX
- Radar station
- KEAX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Mostly cloudy, with a low around 66. West southwest wind 2 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 76. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 80%.
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 72. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.
Mostly sunny, with a high near 61.
Mostly clear, with a low around 39.
Sunny, with a high near 60.
Clear, with a low around 40.
Sunny, with a high near 68.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
90°F |
5 to 9 mph
SSW
|
|
Tuesday Night
Oct 13
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
|
66°F |
2 to 8 mph
WSW
|
|
Wednesday
Oct 14
|
Showers And Thunderstorms
|
76°F |
3 to 7 mph
N
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
61°F |
7 mph
ENE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
72°F |
8 mph
S
|
|
Thursday Night
Oct 15
|
Chance Showers And Thunderstorms
|
51°F |
7 to 10 mph
NW
|
|
Friday
Oct 16
|
Mostly Sunny
|
61°F |
12 to 16 mph
NNW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
39°F |
3 to 12 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
60°F |
5 mph
NNE
|
|
Saturday Night
Oct 17
|
Clear
|
40°F |
1 to 5 mph
SE
|
|
Sunday
Oct 18
|
Sunny
|
68°F |
5 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grain Valley.