Grain Valley Weather Forecast

    • 64
    • 89

    Becoming Sunny

    • 60
    • 86

    Mostly Sunny

    • 66
    • 86

    Mostly Sunny

    • 72
    • 91

    Partly Sunny

    • 74
    • 95

    Partly Sunny

    • 73
    • 94

    Chance Thunderstorms

Today 26 Aug Jackson

Mostly sunny. Highs in the upper 80s. North Winds 5 to 10 Mph.

Tonight 26 Aug Jackson

Mostly clear. Lows in the lower 60s. North Winds 5 to 10 Mph.

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  • Temperature Real-Time

Grain Valley Temperature Statistics

August Temperature

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

  • Lowest 2 August, 2026

    64.7 °F

  • Average August

    79.5 °F

  • Highest 13 August, 2026

    98.7 °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 °F
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