Illinois River State Park Weather Forecast

    • 40
    • 77

    Sunny

    • 42
    • 78

    Mostly Sunny

    • 44
    • 81

    Sunny

    • 46
    • 82

    Mostly Sunny

    • 46
    • 81

    Mostly Sunny

    • 44
    • 78

    Mostly Sunny

Today 27 Sep Eastern Curry County and Josephine County

Sunny. Highs in the mid 60s to mid 70s. North Winds around 5 Mph.

Tonight 27 Sep Eastern Curry County and Josephine County

Mostly clear. Lows in the lower 40s to lower 50s. North Winds 5 to 10 Mph.

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Illinois River State Park Temperature Statistics

September Temperature

Brookings, Brookings Airport (32.3 miles)

  • Lowest 5 September, 2026

    48 °F

  • Average September

    58.6 °F

  • Highest 8 September, 2026

    84.9 °F

Climate (2021–2026)

Brookings, Brookings Airport (32.3 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    53.4 °F

  • Average High 2021–2026

    60.6 °F
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