Cucamonga-Guasti Regional Park Weather Forecast

    • 48
    • 72

    Partly Sunny

    • 46
    • 67

    Partly Sunny

    • 46
    • 71

    Mostly Sunny

    • 48
    • 67

    Partly Sunny

    • 47
    • 63

    Chance Rain Showers

    • 47
    • 64

    Mostly Sunny

Today 29 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 71 to 76. Light Winds becoming west to 10 Mph this afternoon.

Tonight 29 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Patchy fog overnight. Lows 41 to 45 in wind Sheltered Areas to 44 to 49 in warmer Locations. Light Winds.

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  • Temperature Real-Time

Cucamonga-Guasti Regional Park Temperature Statistics

November Temperature

Ontario International Airport (1.2 miles)

  • Lowest 19 November, 2025

    45 °F

  • Average November

    62.5 °F

  • Highest 10 November, 2025

    93 °F

Climate (2020–Present)

Ontario International Airport (1.2 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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