Ontario Weather Forecast

    • 31
    • 48

    Mostly Cloudy

    • 37
    • 52

    Chance Rain

    • 26
    • 49

    Partly Sunny

    • 24
    • 49

    Slight Chance Snow

    • 18
    • 39

    Mostly Sunny

    • 30
    • 48

    Mostly Sunny

Today 3 Apr Vernon

Mostly cloudy. Cooler with Highs in the upper 40s. West Winds 10 to 15 Mph.

Tonight 3 Apr Vernon

Mostly cloudy. Lows in the lower 30s. Northwest Winds around 5 Mph, becoming northeast after midnight.

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Ontario Temperature Statistics

April Temperature

Sparta, Sparta / Fort McCoy Airport (17.4 miles)

  • Lowest 1 April, 2025

    16.5 °F

  • Average April

    32.2 °F

  • Highest 1 April, 2025

    43.2 °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 °F

  • Average High 2020–2025

    57.7 °F
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