Alton Weather Forecast

    • 63
    • 86

    Sunny

    • 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 18 Aug Crawford

Sunny. Patchy fog early in the morning. Highs in the lower 80s. North Winds up to 5 Mph.

Tonight 18 Aug Crawford

Mostly clear. Patchy fog late in the night. Lows in the mid 60s. Light Winds.

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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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