Plum Island Weather Forecast

    • 77
    • 95

    Sunny

    • 74
    • 94

    Partly Sunny

    • 72
    • 92

    Chance Thunderstorms

    • 74
    • 92

    Chance Thunderstorms

    • 72
    • 94

    Chance Thunderstorms

    • 70
    • 89

    Chance Thunderstorms

    • 71
    • 90

    Chance Thunderstorms

Today 22 Jun La Salle

Mostly sunny. Breezy. Hot and humid. Highs in the mid 90s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Heat index Values up to 106.

Tonight 22 Jun La Salle

Clear, breezy. Warm and humid. Lows in the mid 70s. South Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening. Heat index Values up to 101 early in the evening.

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Plum Island Temperature Statistics

June Temperature

Illinois Valley Regional Airport (8.1 miles)

  • Lowest 1 June, 2025

    47.3 °F

  • Average June

    70.9 °F

  • Highest 17 June, 2025

    91.6 °F

Climate (2020–Present)

Illinois Valley Regional Airport (8.1 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62 °F
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