Ontario Weather Forecast

    • 72
    • 89

    Chance Thunderstorms

    • 73
    • 89

    Chance Thunderstorms

    • 73
    • 92

    Chance Thunderstorms

    • 71
    • 89

    Chance Thunderstorms

    • 72
    • 90

    Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

Today 24 Jun Knox

Partly sunny. A slight chance of Showers and Thunderstorms in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Humid with Highs around 90. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent. Heat index Values up to 100.

Tonight 24 Jun Knox

Mostly cloudy with a chance of Showers and Thunderstorms. Humid with Lows in the lower 70s. Southwest Winds around 5 Mph. Chance of rain 50 percent.

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Ontario Temperature Statistics

June Temperature

Galesburg Municipal Airport (11.8 miles)

  • Lowest 10 June, 2025

    47.5 °F

  • Average June

    69.7 °F

  • Highest 21 June, 2025

    90.5 °F

Climate (2020–Present)

Galesburg Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    41.1 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    61.5 °F
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