Arnold Weather Forecast

    • 45
    • 51

    Rain Showers

    • 45
    • 50

    Rain

    • 44
    • 54

    Rain

    • 42
    • 47

    Rain

    • 39
    • 45

    Rain

    • 36
    • 45

    Rain

Today 21 Dec West Slope Northern Sierra Nevada

Heavy rain. Highs 37 to 52 higher Elevations. 48 to 56 lower Elevations. Prevailing south Winds 10 to 20 Mph with Gusts to around 55 Mph. Except south 10 to 35 Mph with Gusts to around 60 Mph over Ridges.

Tonight 21 Dec West Slope Northern Sierra Nevada

Heavy rain Showers and a slight chance of Thunderstorms at lower Elevations. And heavy rain Showers, heavy snow and a slight chance of Thunderstorms at higher Elevations. Breezy, Colder. Some Thunderstorms may produce heavy rainfall after midnight. Lows 29 to 43 higher Elevations. 40 to 50 lower Elevations. No snow accumulation lower Elevations. 4 to 10 Inches higher Elevations. Snow level above 8000 feet. Prevailing south Winds 10 to 25 Mph decreasing to 5 to 15 Mph after midnight. Gusts up to 50 Mph. Over Ridges. Prevailing southwest Winds 20 to 35 Mph.

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Arnold Temperature Statistics

December Temperature

COLUMBIA (15.5 miles)

  • Lowest 4 December, 2025

    30.2 °F

  • Average December

    45.4 °F

  • Highest 12 December, 2025

    73.4 °F

Climate (2020–Present)

COLUMBIA (15.5 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    59.8 °F

  • Average High 2020–2025

    73.6 °F
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