Cucamonga-Guasti Regional Park Weather Forecast

    • 58
    • 79

    Partly Sunny

    • 57
    • 85

    Partly Sunny

    • 57
    • 85

    Mostly Sunny

    • 55
    • 82

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

    • 56
    • 79

    Partly Sunny

    • 53
    • 71

    Chance Rain Showers

Today 3 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny this morning. Becoming partly cloudy. Warmer. Highs 77 to 82. Areas of Winds north 20 to 30 Mph. Gusts to 50 Mph. Becoming 45 Mph this afternoon.

Tonight 3 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly clear. Lows 45 to 49 in wind Sheltered Areas to 49 to 58 in warmer Locations. Areas of Winds north 10 to 20 Mph becoming east overnight. Gusts to 35 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cucamonga-Guasti Regional Park Temperature Statistics

April Temperature

Ontario International Airport (1.2 miles)

  • Lowest 1 April, 2026

    57.9 °F

  • Average April

    63.4 °F

  • Highest 1 April, 2026

    72 °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

    79.3 °F
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