Ottawa Weather Forecast

    • 56
    • 72

    Mostly Sunny

    • 60
    • 77

    Mostly Sunny

    • 60
    • 79

    Mostly Cloudy

    • 59
    • 73

    Rain Showers Likely

    • 55
    • 75

    Chance Rain Showers

Today 18 Jun La Salle

Mostly cloudy in the Morning, then becoming partly cloudy. Highs in the lower 70s. Northwest Winds 10 to 15 Mph. Gusts up to 25 Mph in the morning.

Tonight 18 Jun La Salle

Mostly clear. Lows in the mid 50s. West Winds around 5 Mph.

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Ottawa Temperature Statistics

June Temperature

Illinois Valley Regional Airport (15.5 miles)

  • Lowest 3 June, 2026

    51.8 °F

  • Average June

    72.3 °F

  • Highest 6 June, 2026

    91.4 °F

Climate (2021–2026)

Illinois Valley Regional Airport (15.5 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    62.6 °F
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