Ontario Weather Forecast

    • 43
    • 68

    Partly Sunny

    • 35
    • 59

    Isolated Thunderstorms

    • 36
    • 58

    Partly Sunny

    • 37
    • 61

    Mostly Sunny

    • 42
    • 67

    Partly Sunny

    • 43
    • 70

    Mostly Sunny

Today 28 Apr Oregon Lower Treasure Valley

Increasing Clouds. Highs 64 to 69. West Winds 10 to 15 Mph.

Tonight 28 Apr Oregon Lower Treasure Valley

Partly cloudy. Lows 39 to 44. East Winds around 10 Mph in the Evening, shifting to northwest after midnight. Gusts to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario Temperature Statistics

April Temperature

Ontario Municipal Airport (1.9 miles)

  • Lowest 18 April, 2024

    28.9 °F

  • Average April

    54 °F

  • Highest 12 April, 2024

    82.7 °F

Climate (2019–Present)

Ontario Municipal Airport (1.9 miles)

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  • Average Low 2019–2024

    42.4 °F

  • Average 2019–2024

    54.2 °F

  • Average High 2019–2024

    66.6 °F
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