Upland Weather Forecast

    • 51
    • 71

    Increasing Clouds

    • 51
    • 72

    Mostly Cloudy

    • 51
    • 73

    Mostly Cloudy

    • 55
    • 69

    Rain

    • 53
    • 62

    Rain

    • 50
    • 62

    Rain Showers

Today 20 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 70 to 75. Light Winds.

Tonight 20 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 42 to 47 in wind Sheltered Areas to 47 to 55 in warmer Locations. Light Winds.

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  • Temperature Real-Time

Upland Temperature Statistics

December Temperature

Ontario International Airport (5 miles)

  • Lowest 2 December, 2025

    46 °F

  • Average December

    61.5 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (5 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79 °F
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