Henderson Weather Forecast

    • 63
    • 80

    Mostly Sunny

    • 64
    • 82

    Chance Thunderstorms

    • 61
    • 79

    Mostly Sunny

    • 59
    • 78

    Partly Sunny

    • 62
    • 78

    Partly Sunny

    • 65
    • 81

    Slight Chance Thunderstorms

Today 20 Aug Knox

Patchy fog this morning. Sunny. Highs around 80. Northeast Winds around 5 Mph.

Tonight 20 Aug Knox

Mostly clear. Lows in the lower 60s. East Winds around 5 Mph, becoming southeast after midnight.

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Henderson Temperature Statistics

August Temperature

Galesburg Municipal Airport (7.5 miles)

  • Lowest 3 August, 2026

    57.7 °F

  • Average August

    73.8 °F

  • Highest 10 August, 2026

    88.2 °F

Climate (2021–2026)

Galesburg Municipal Airport (7.5 miles)

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  • Average Low 2021–2026

    41.8 °F

  • Average 2021–2026

    52.1 °F

  • Average High 2021–2026

    62.5 °F
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