Alton Weather Forecast

    • 65
    • 84

    Rain Showers Likely

    • 63
    • 84

    Chance Thunderstorms

    • 62
    • 86

    Mostly Sunny

    • 61
    • 86

    Slight Chance Thunderstorms

    • 60
    • 85

    Mostly Sunny

    • 63
    • 85

    Partly Sunny

Today 19 Aug Crawford

Partly sunny. Slight chance of Showers in the Morning, then slight chance of Thunderstorms in the afternoon. Highs in the lower 80s. Southwest Winds up to 5 Mph. Chance of precipitation 20 percent.

Tonight 19 Aug Crawford

Mostly cloudy. Chance of Thunderstorms in the Evening, then Showers likely and chance of Thunderstorms after midnight. Lows in the mid 60s. Light Winds. Chance of precipitation 70 percent.

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Alton Temperature Statistics

August Temperature

Fort Knox (28.6 miles)

  • Lowest 3 August, 2026

    64.9 °F

  • Average August

    78.5 °F

  • Highest 16 August, 2026

    94.6 °F

Climate (2021–2026)

Fort Knox (28.6 miles)

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  • Average Low 2021–2026

    48.1 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    67.5 °F
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