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Grain Valley, MO Weather Forecast
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Grain Valley Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  | |  | | | |  |  |  |
| Mostly Cloudy | Chance of Showers | Chance of T-Storm | Mostly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Sunny | Clear |
| Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C |
| POP: 20% | POP: 50% | POP: 90% | POP: 100% | POP: 100% |
POP = Probability of Precipitation.
Weather Outlook Updated: 147 AM CDT Tue Sep 29 2026 
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Issued: 1152 PM CDT Mon Sep 28 2026
Key Messages
- Warmer and dry conditions expected through Tuesday for most.
- Several rounds of showers and storms are expected (>95% chance for accumulating rainfall) across the forecast area Tuesday night through Thursday night. Heavy rainfall and flooding will be possible.
Discussion
... Issued at 221 PM CDT Mon Sep 28 2026
A quiet day has prevailed across the area thanks to the influences of building mid-level ridging and lingering surface high pressure. With the 850mb thermal ridge remaining displa...