Jonesboro Weather Forecast

    • 68
    • 92

    Decreasing Clouds

    • 71
    • 89

    Mostly Sunny

    • 73
    • 97

    Hot

    • 73
    • 96

    Mostly Sunny

    • 71
    • 95

    Partly Sunny

    • 69
    • 93

    Mostly Sunny

Today 13 Sep Union

Mostly sunny. Near steady temperature around 90. North Winds around 5 Mph.

Tonight 13 Sep Union

Partly cloudy in the Evening, then clearing. Lows in the upper 60s. Northeast Winds 5 to 10 Mph.

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Jonesboro Temperature Statistics

September Temperature

Southern Illinois Airport (22.4 miles)

  • Lowest 8 September, 2026

    59 °F

  • Average September

    83 °F

  • Highest 5 September, 2026

    103.6 °F

Climate (2021–2026)

Southern Illinois Airport (22.4 miles)

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  • Average Low 2021–2026

    48.3 °F

  • Average 2021–2026

    58.9 °F

  • Average High 2021–2026

    69.4 °F
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