LaSalle Weather Forecast

    • 58
    • 88

    Mostly Sunny

    • 61
    • 89

    Mostly Sunny

    • 61
    • 86

    Chance Thunderstorms

    • 63
    • 83

    Chance Rain Showers

    • 63
    • 83

    Chance Rain Showers

    • 61
    • 81

    Chance Rain Showers

Today 17 Sep La Salle

Mostly sunny. Patchy fog through mid morning. Highs in the mid 80s. Northeast Winds around 5 Mph.

Tonight 17 Sep La Salle

Mostly clear. Lows in the upper 50s. East Winds around 5 Mph.

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LaSalle Temperature Statistics

September Temperature

Illinois Valley Regional Airport (3.1 miles)

  • Lowest 7 September, 2025

    39.6 °F

  • Average September

    64.1 °F

  • Highest 14 September, 2025

    91.6 °F

Climate (2020–Present)

Illinois Valley Regional Airport (3.1 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62 °F
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