Ontario Weather Forecast

    • 55
    • 87

    Becoming Sunny

    • 57
    • 85

    Mostly Sunny

    • 62
    • 90

    Partly Sunny

    • 64
    • 95

    Mostly Sunny

    • 65
    • 99

    Hot

    • 68
    • 101

    Hot

Today 7 Aug Oregon Lower Treasure Valley

Sunny. Highs 84 to 89. Northwest Winds 10 to 15 Mph with Gusts to 25 Mph.

Tonight 7 Aug Oregon Lower Treasure Valley

Mostly clear. Lows 51 to 56. Breezy. Northwest Winds 10 to 20 Mph with Gusts to 30 Mph.

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Ontario Temperature Statistics

August Temperature

Ontario Municipal Airport (1.9 miles)

  • Lowest 5 August, 2025

    52 °F

  • Average August

    74.7 °F

  • Highest 2 August, 2025

    94.6 °F

Climate (2020–Present)

Ontario Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    67.1 °F
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