Ontario Weather Forecast

    • 68
    • 86

    Chance Thunderstorms

    • 62
    • 88

    Thunderstorms Likely

    • 54
    • 80

    Rain Showers

    • 57
    • 79

    Mostly Sunny

    • 54
    • 81

    Chance Thunderstorms

    • 50
    • 74

    Partly Sunny

    • 51
    • 73

    Slight Chance Thunderstorms

Today 9 Jun Vernon

Partly sunny. Highs in the mid 80s. South Winds around 5 Mph.

Tonight 9 Jun Vernon

Partly cloudy this Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the upper 60s. Southeast Winds 5 to 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario Temperature Statistics

June Temperature

Sparta, Sparta / Fort McCoy Airport (17.4 miles)

  • Lowest 3 June, 2026

    39.4 °F

  • Average June

    68.3 °F

  • Highest 4 June, 2026

    87.1 °F

Climate (2021–Present)

Sparta, Sparta / Fort McCoy Airport (17.4 miles)

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  • Average Low 2021–2026

    34.9 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    58.3 °F
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