Ontario Weather Forecast

    • 65
    • 83

    Rain Showers Likely

    • 62
    • 82

    Rain Showers Likely

    • 59
    • 79

    Rain Showers Likely

    • 60
    • 80

    Slight Chance Thunderstorms

    • 68
    • 83

    Chance Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

Today 16 Jun Vernon

Mostly cloudy. Isolated Showers and Thunderstorms after Midnight, then a chance of Showers and Thunderstorms. Humid with Highs in the lower 80s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 16 Jun Vernon

Showers and Thunderstorms likely. Humid with Lows in the mid 60s. Southwest Winds 5 to 10 Mph. Chance of rain 70 percent.

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Ontario Temperature Statistics

June Temperature

Sparta, Sparta / Fort McCoy Airport (17.4 miles)

  • Lowest 1 June, 2025

    34.9 °F

  • Average June

    64.5 °F

  • Highest 2 June, 2025

    87.6 °F

Climate (2020–Present)

Sparta, Sparta / Fort McCoy Airport (17.4 miles)

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  • Average Low 2020–2025

    34.2 °F

  • Average 2020–2025

    47.1 °F

  • Average High 2020–2025

    57.8 °F
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