Grain Valley Weather Forecast

    • 67
    • 91

    Rain Showers

    • 62
    • 83

    Chance Rain Showers

    • 67
    • 86

    Rain Showers Likely

    • 66
    • 85

    Chance Thunderstorms

    • 70
    • 88

    Slight Chance Thunderstorms

    • 64
    • 90

    Rain Showers Likely

Today 9 Sep Jackson

Mostly sunny Early, then becoming partly sunny. A chance of Showers with a slight chance of Thunderstorms this morning. Showers likely with a chance of Thunderstorms this afternoon. Not as warm with Highs in the upper 80s. Southwest Winds 5 to 10 Mph, becoming northeast. Chance of rain 70 percent.

Tonight 9 Sep Jackson

Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Lows in the upper 60s. East Winds around 5 Mph, becoming north after midnight. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grain Valley Temperature Statistics

September Temperature

Lee's Summit, Lee's Summit Municipal Airport (9.9 miles)

  • Lowest 6 September, 2026

    72.6 °F

  • Average September

    86.4 °F

  • Highest 1 September, 2026

    99.6 °F

Climate (2021–2026)

Lee's Summit, Lee's Summit Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    48.5 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.1 °F
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