Fort Kaskaskia State Park Weather Forecast

    • 76
    • 92

    Chance Thunderstorms

    • 77
    • 97

    Hot

    • 76
    • 97

    Hot

    • 76
    • 97

    Hot

    • 77
    • 96

    Slight Chance Thunderstorms

    • 76
    • 95

    Chance Thunderstorms

Today 21 Jul Randolph

Partly sunny. A chance of Showers and Thunderstorms, mainly in the morning. Humid with Highs in the lower 90s. Northwest Winds around 5 Mph, becoming southeast in the afternoon. Chance of rain 50 percent. Heat index Values up to 107 in the afternoon.

Tonight 21 Jul Randolph

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Humid with Lows in the mid 70s. Southeast Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 105 early in the evening.

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Fort Kaskaskia State Park Temperature Statistics

July Temperature

Sparta Community-Hunter Field Airport (16.2 miles)

  • Lowest 2 July, 2025

    68.9 °F

  • Average July

    81.1 °F

  • Highest 11 July, 2025

    95.4 °F

Climate (2020–Present)

Sparta Community-Hunter Field Airport (16.2 miles)

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  • Average Low 2020–2025

    48.1 °F

  • Average 2020–2025

    57.2 °F

  • Average High 2020–2025

    66.5 °F
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