St Jons Weather Forecast

    • 75
    • 99

    Slight Chance Thunderstorms

    • 75
    • 100

    Hot

    • 72
    • 99

    Chance Thunderstorms

    • 68
    • 91

    Chance Thunderstorms

    • 68
    • 88

    Partly Sunny

    • 68
    • 91

    Mostly Sunny

Today 17 Aug Perry

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Hot with Highs in the upper 90s. South Winds around 5 Mph, becoming east this afternoon. Chance of rain 20 percent.

Tonight 17 Aug Perry

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the mid 70s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

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St Jons Temperature Statistics

August Temperature

Southern Illinois Airport (16.8 miles)

  • Lowest 3 August, 2025

    55.7 °F

  • Average August

    77.9 °F

  • Highest 8 August, 2025

    92.6 °F

Climate (2020–Present)

Southern Illinois Airport (16.8 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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