Grain Valley Weather Forecast

    • 79
    • 99

    Slight Chance Thunderstorms

    • 78
    • 100

    Hot

    • 79
    • 100

    Hot

    • 77
    • 100

    Hot

    • 71
    • 96

    Chance Thunderstorms

    • 68
    • 87

    Slight Chance Thunderstorms

Today 12 Aug Jackson

Partly sunny. Hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph with Gusts up to 25 Mph. Heat index Values up to 109 this afternoon.

Tonight 12 Aug Jackson

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 70s. Southeast Winds 5 to 10 Mph. Heat index Values up to 107 early in the evening.

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  • Temperature Forecast NOAA

  • 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

    78.7 °F

  • Highest 9 August, 2026

    93.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    48.4 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68 °F
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