Cucamonga-Guasti Regional Park Weather Forecast

    • 50
    • 66

    Becoming Sunny

    • 53
    • 75

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 55
    • 75

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 57
    • 83

    Partly Sunny

Today 27 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 64 to 69. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 27 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 42 to 50. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Cucamonga-Guasti Regional Park Temperature Statistics

April Temperature

Ontario International Airport (1.2 miles)

  • Lowest 13 April, 2026

    49.6 °F

  • Average April

    67.3 °F

  • Highest 4 April, 2026

    89.7 °F

Climate (2021–Present)

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

    79.4 °F
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