Cucamonga-Guasti Regional Park Weather Forecast

    • 55
    • 70

    Rain Showers

    • 48
    • 61

    Rain Showers

    • 48
    • 66

    Mostly Sunny

    • 52
    • 73

    Sunny

    • 54
    • 77

    Mostly Sunny

    • 55
    • 79

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

Today 13 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Patchy fog this morning. Partly cloudy. Highs 67 to 73. Areas of Winds south 10 to 20 Mph. Gusts to 25 Mph. Becoming 30 Mph this afternoon.

Tonight 13 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. A chance of Showers. Lows 48 to 54. Areas of Winds south 10 to 20 Mph with Gusts to 30 Mph. Chance of measurable precipitation 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Cucamonga-Guasti Regional Park Temperature Statistics

October Temperature

Ontario International Airport (1.2 miles)

  • Lowest 4 October, 2025

    57 °F

  • Average October

    68.9 °F

  • Highest 10 October, 2025

    91.9 °F

Climate (2020–Present)

Ontario International Airport (1.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79 °F
Get WillyWeather+ to remove ads