Saint John Mountain Weather Forecast

    • 35
    • 47

    Rain Showers

    • 34
    • 39

    Rain Showers

    • 33
    • 40

    Rain Showers

    • 32
    • 40

    Rain Showers

    • 32
    • 39

    Rain/Snow

    • 32
    • 37

    Rain/Snow

Today 21 Dec Mountains Southwestern Shasta County to Western Colusa County

Heavy rain Showers. Breezy. Highs 45 to 60. Prevailing south Winds 10 to 25 Mph with Gusts to around 40 Mph.

Tonight 21 Dec Mountains Southwestern Shasta County to Western Colusa County

A chance of rain Showers and a slight chance of Thunderstorms in the Evening, then rain Showers likely after midnight. Colder. Some Thunderstorms may produce heavy rainfall in the evening. Lows 33 to 47. Prevailing southwest Winds up to 20 Mph with Gusts to around 35 Mph.

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Saint John Mountain Temperature Statistics

December Temperature

Ukiah Municipal Airport (34.2 miles)

  • Lowest 13 December, 2025

    30 °F

  • Average December

    48.5 °F

  • Highest 10 December, 2025

    72 °F

Climate (2020–Present)

Ukiah Municipal Airport (34.2 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76 °F
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