Plum Island Weather Forecast

    • 27
    • 33

    Gradual Clearing

    • 33
    • 42

    Partly Sunny

    • 33
    • 50

    Mostly Cloudy

    • 17
    • 34

    Chance Snow Showers

    • 24
    • 29

    Chance Snow Showers

    • 19
    • 34

    Chance Snow Showers

Today 11 Jan La Salle

Mostly cloudy in the Morning, then becoming partly cloudy. Scattered Flurries early in the morning. Blustery. Highs in the lower 30s. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph, becoming west 10 to 15 Mph with Gusts up to 25 Mph in the afternoon.

Tonight 11 Jan La Salle

Partly cloudy. Near steady temperature in the upper 20s. Southwest Winds 10 to 15 Mph. Gusts up to 25 Mph after midnight.

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Plum Island Temperature Statistics

January Temperature

Illinois Valley Regional Airport (8.1 miles)

  • Lowest 1 January, 2026

    14 °F

  • Average January

    34.8 °F

  • Highest 8 January, 2026

    62.6 °F

Climate (2021–Present)

Illinois Valley Regional Airport (8.1 miles)

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  • Average Low 2021–2026

    43.2 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    62.2 °F
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