Ottawa Weather Forecast

    • 55
    • 77

    Partly Sunny

    • 58
    • 79

    Mostly Sunny

    • 63
    • 81

    Partly Sunny

    • 64
    • 83

    Slight Chance Thunderstorms

    • 66
    • 84

    Mostly Sunny

    • 69
    • 86

    Mostly Sunny

Today 2 Aug La Salle

Partly cloudy. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 2 Aug La Salle

Mostly clear. Lows in the mid 50s. East Winds around 5 Mph in the Evening, becoming light and variable.

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Ottawa Temperature Statistics

August Temperature

Illinois Valley Regional Airport (15.5 miles)

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Climate (2020–Present)

Illinois Valley Regional Airport (15.5 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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