Cucamonga-Guasti Regional Park Weather Forecast

    • 65
    • 95

    Mostly Sunny

    • 66
    • 98

    Hot

    • 65
    • 99

    Hot

    • 65
    • 94

    Mostly Sunny

    • 65
    • 92

    Partly Sunny

    • 66
    • 92

    Partly Sunny

    • 68
    • 94

    Mostly Sunny

Today 7 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 92 to 100. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 7 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 59 to 64. Areas of Winds west to 10 Mph with Gusts to 25 Mph this evening becoming light.

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Cucamonga-Guasti Regional Park Temperature Statistics

July Temperature

Ontario International Airport (1.2 miles)

  • Lowest 3 July, 2026

    59.6 °F

  • Average July

    75.1 °F

  • Highest 4 July, 2026

    93.7 °F

Climate (2021–2026)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.3 °F
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