Alton Weather Forecast

    • 69
    • 92

    Mostly Sunny

    • 69
    • 91

    Mostly Sunny

    • 70
    • 93

    Mostly Sunny

    • 70
    • 91

    Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

    • 70
    • 91

    Chance Thunderstorms

Today 9 Aug Crawford

Sunny. Highs in the lower 90s. South Winds up to 5 Mph.

Tonight 9 Aug Crawford

Mostly clear. Lows in the upper 60s. South Winds up to 5 Mph in the evening becoming light.

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Alton Temperature Statistics

August Temperature

Fort Knox (28.6 miles)

  • Lowest 2 August, 2025

    60.8 °F

  • Average August

    73.9 °F

  • Highest 7 August, 2025

    89.2 °F

Climate (2020–Present)

Fort Knox (28.6 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    66.9 °F
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