Santa Ana River Weather Forecast

    • 54
    • 84

    Mostly Sunny

    • 51
    • 80

    Mostly Sunny

    • 52
    • 78

    Partly Sunny

    • 50
    • 77

    Partly Sunny

    • 49
    • 77

    Mostly Cloudy

    • 50
    • 72

    Chance Rain Showers

Today 18 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 82 to 86. Areas of Winds east to 10 Mph in the morning becoming light.

Tonight 18 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 49 to 52 in wind Sheltered Areas to 53 to 59 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

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Santa Ana River Temperature Statistics

December Temperature

San Bernardino Intl. Airport (2.5 miles)

  • Lowest 4 December, 2025

    40.3 °F

  • Average December

    57.9 °F

  • Highest 10 December, 2025

    87.8 °F

Climate (2020–Present)

San Bernardino Intl. Airport (2.5 miles)

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  • Average Low 2020–2025

    54.1 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    80.3 °F
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