Grain Valley Weather Forecast

    • 23
    • 40

    Mostly Cloudy

    • 8
    • 30

    Mostly Cloudy

    • 15
    • 22

    Mostly Sunny

    • 28
    • 44

    Mostly Sunny

    • 36
    • 53

    Partly Sunny

    • 39
    • 59

    Mostly Cloudy

    • 34
    • 53

    Partly Sunny

Today 12 Dec Jackson

Mostly sunny and cooler. Near steady temperature in the upper 30s. North Winds 5 to 10 Mph.

Tonight 12 Dec Jackson

Mostly sunny Early, then becoming mostly cloudy. Lows in the lower 20s. North Winds 5 to 10 Mph.

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Grain Valley Temperature Statistics

December Temperature

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

  • Lowest 4 December, 2025

    12 °F

  • Average December

    31.3 °F

  • Highest 9 December, 2025

    55 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    48.1 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    67.2 °F
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