Jacob Weather Forecast

    • 71
    • 99

    Rain Showers

    • 66
    • 86

    Rain Showers Likely

    • 67
    • 87

    Chance Rain Showers

    • 68
    • 92

    Chance Rain Showers

    • 69
    • 92

    Partly Sunny

    • 70
    • 94

    Slight Chance Thunderstorms

Today 9 Sep Jackson

Sunny with a chance of Showers. A chance of Thunderstorms this afternoon. Hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent. Highest heat index Readings heat index Readings up to 106 this afternoon.

Tonight 9 Sep Jackson

Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Humid with Lows in the lower 70s. West Winds around 5 Mph. Chance of rain 70 percent.

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Jacob Temperature Statistics

September Temperature

Southern Illinois Airport (15.5 miles)

  • Lowest 1 September, 2026

    70.6 °F

  • Average September

    88.3 °F

  • Highest 5 September, 2026

    100.4 °F

Climate (2021–2026)

Southern Illinois Airport (15.5 miles)

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  • Average Low 2021–2026

    48.2 °F

  • Average 2021–2026

    58.8 °F

  • Average High 2021–2026

    69.4 °F
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