Cucamonga-Guasti Regional Park Weather Forecast

    • 50
    • 73

    Becoming Sunny

    • 52
    • 76

    Sunny

    • 53
    • 81

    Sunny

    • 52
    • 80

    Sunny

    • 51
    • 79

    Mostly Sunny

    • 52
    • 79

    Mostly Sunny

    • 51
    • 78

    Mostly Sunny

Today 12 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 71 to 76. Areas of Winds north 15 to 25 Mph with Gusts to 40 Mph.

Tonight 12 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 41 to 45 in wind Sheltered Areas to 46 to 52 in warmer Locations. Areas of Winds east 10 to 20 Mph. Gusts to 40 Mph. Becoming 35 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cucamonga-Guasti Regional Park Temperature Statistics

January Temperature

Ontario International Airport (1.2 miles)

  • Lowest 8 January, 2026

    46 °F

  • Average January

    56.4 °F

  • Highest 10 January, 2026

    68 °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

    78.9 °F
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