Cucamonga-Guasti Regional Park Weather Forecast

    • 44
    • 71

    Becoming Sunny

    • 47
    • 72

    Mostly Sunny

    • 47
    • 71

    Mostly Cloudy

    • 49
    • 76

    Sunny

    • 52
    • 78

    Partly Sunny

    • 53
    • 79

    Partly Sunny

Today 26 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this morning. Becoming partly cloudy. Highs 66 to 72. Areas of Winds east 10 to 15 Mph with Gusts to 30 Mph.

Tonight 26 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 35 to 40 in wind Sheltered Areas to 40 to 47 in warmer Locations. Areas of Winds east 10 to 15 Mph. Gusts to 30 Mph. Becoming 25 Mph overnight.

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Cucamonga-Guasti Regional Park Temperature Statistics

January Temperature

Ontario International Airport (1.2 miles)

  • Lowest 11 January, 2026

    39.7 °F

  • Average January

    59.7 °F

  • Highest 14 January, 2026

    84.7 °F

Climate (2021–Present)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    66.6 °F

  • Average High 2021–2026

    79 °F
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