Rend Lake State Wildlife Refuge Weather Forecast

    • 71
    • 89

    Becoming Sunny

    • 77
    • 93

    Mostly Sunny

    • 76
    • 95

    Rain Showers Likely

    • 69
    • 85

    Slight Chance Thunderstorms

    • 72
    • 86

    Chance Rain Showers

    • 73
    • 90

    Chance Rain Showers

Today 7 Sep Jefferson

Sunny. Highs around 90. Northeast Winds 5 to 10 Mph.

Tonight 7 Sep Jefferson

Partly cloudy. Near steady temperature in the upper 60s. Northeast Winds around 5 Mph.

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Rend Lake State Wildlife Refuge Temperature Statistics

September Temperature

Mount Vernon Airport (13.7 miles)

  • Lowest 1 September, 2026

    66.9 °F

  • Average September

    84.3 °F

  • Highest 2 September, 2026

    100.9 °F

Climate (2021–2026)

Mount Vernon Airport (13.7 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    69.2 °F
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