Grain Valley Weather Forecast

    • 72
    • 92

    Slight Chance Thunderstorms

    • 72
    • 90

    Rain Showers Likely

    • 67
    • 89

    Chance Rain Showers

    • 65
    • 82

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

    • 67
    • 87

    Mostly Sunny

Today 29 Jul Jackson

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 90s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 104.

Tonight 29 Jul Jackson

A slight chance of Thunderstorms in the evening. Patchy smoke in the evening. Partly cloudy with a slight chance of Showers. Lows in the lower 70s. East Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 102 early in the evening.

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Grain Valley Temperature Statistics

July Temperature

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

  • Lowest 5 July, 2026

    65.6 °F

  • Average July

    80.8 °F

  • Highest 27 July, 2026

    98.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    48.4 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68 °F
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