Grain Valley Weather Forecast

    • 62
    • 83

    Rain Showers Likely

    • 60
    • 81

    Chance Rain Showers

    • 63
    • 84

    Chance Rain Showers

    • 63
    • 82

    Chance Thunderstorms

    • 60
    • 84

    Chance Thunderstorms

    • 58
    • 82

    Mostly Sunny

Today 18 Sep Jackson

Showers likely with a chance of Thunderstorms. Highs in the lower 80s. Southeast Winds around 5 Mph, becoming southwest in the afternoon. Chance of rain 70 percent.

Tonight 18 Sep Jackson

Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. Southwest Winds 5 to 10 Mph. Chance of rain 60 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, 2025

    50 °F

  • Average September

    71.9 °F

  • Highest 13 September, 2025

    95 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    48 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    67.1 °F
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