Cucamonga-Guasti Regional Park Weather Forecast

    • 60
    • 89

    Increasing Clouds

    • 64
    • 90

    Partly Sunny

    • 60
    • 91

    Mostly Sunny

    • 57
    • 82

    Mostly Cloudy

    • 54
    • 73

    Slight Chance Rain Showers

    • 53
    • 71

    Partly Sunny

    • 52
    • 70

    Partly Sunny

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

Mostly sunny. Highs 87 to 92. Light Winds becoming southwest 10 to 15 Mph with Gusts to 25 Mph this afternoon.

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

Partly cloudy this evening. Becoming mostly clear. Lows 52 to 56 in wind Sheltered Areas to 56 to 63 in warmer Locations. Areas of Winds southwest to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cucamonga-Guasti Regional Park Temperature Statistics

March Temperature

Ontario International Airport (1.2 miles)

  • Lowest 6 March, 2026

    50.6 °F

  • Average March

    71 °F

  • Highest 19 March, 2026

    100.7 °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

    79.3 °F
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