Cucamonga-Guasti Regional Park Weather Forecast

    • 54
    • 75

    Slight Chance Rain Showers

    • 52
    • 71

    Rain Showers

    • 48
    • 63

    Rain Showers

    • 48
    • 66

    Partly Sunny

    • 50
    • 72

    Sunny

    • 53
    • 77

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

Today 10 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 73 to 78. Areas of Winds south to 10 Mph becoming southwest 10 to 20 Mph with Gusts to 30 Mph this afternoon.

Tonight 10 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this Evening, then mostly cloudy with a slight chance of Showers overnight. Lows 47 to 53. Areas of Winds southwest 10 to 15 Mph with Gusts to 30 Mph. Becoming to 10 Mph overnight. Chance of measurable precipitation 20 percent.

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Cucamonga-Guasti Regional Park Temperature Statistics

April Temperature

Ontario International Airport (1.2 miles)

  • Lowest 3 April, 2026

    50.6 °F

  • Average April

    69.4 °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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