Plum Island Weather Forecast

    • 37
    • 57

    Slight Chance Rain Showers

    • 34
    • 56

    Decreasing Clouds

    • 46
    • 62

    Partly Sunny

    • 53
    • 69

    Slight Chance Thunderstorms

    • 41
    • 65

    Partly Sunny

    • 35
    • 56

    Mostly Sunny

    • 42
    • 61

    Chance Rain Showers

Today 10 Apr La Salle

Mostly cloudy. Areas of fog late in the morning. A slight chance of Showers. Highs in the upper 50s. East Winds 5 to 10 Mph, increasing to northeast 10 to 15 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 10 Apr La Salle

Mostly cloudy through the early Overnight, then becoming partly cloudy. Lows in the mid 30s. Northeast Winds 5 to 10 Mph.

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Plum Island Temperature Statistics

April Temperature

Illinois Valley Regional Airport (8.1 miles)

  • Lowest 8 April, 2025

    25.5 °F

  • Average April

    44 °F

  • Highest 2 April, 2025

    73.2 °F

Climate (2020–Present)

Illinois Valley Regional Airport (8.1 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    61.8 °F
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