Ontario Weather Forecast

    • 61
    • 90

    Mostly Cloudy

    • 59
    • 91

    Slight Chance Thunderstorms

    • 58
    • 90

    Sunny

    • 61
    • 93

    Sunny

    • 59
    • 94

    Mostly Sunny

    • 53
    • 85

    Mostly Sunny

    • 48
    • 71

    Chance Rain Showers

Today 15 Jun Oregon Lower Treasure Valley

Mostly sunny. Highs 86 to 91. Northwest Winds 10 to 15 Mph.

Tonight 15 Jun Oregon Lower Treasure Valley

Partly cloudy. Lows 57 to 62. North Winds up to 10 Mph.

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Ontario Temperature Statistics

June Temperature

Ontario Municipal Airport (1.9 miles)

  • Lowest 4 June, 2025

    47.6 °F

  • Average June

    72.1 °F

  • Highest 9 June, 2025

    98.7 °F

Climate (2020–Present)

Ontario Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    67 °F
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