Saint John Mountain Weather Forecast

    • 58
    • 69

    Sunny

    • 60
    • 72

    Sunny

    • 61
    • 74

    Mostly Sunny

    • 58
    • 70

    Partly Sunny

    • 56
    • 65

    Slight Chance Rain Showers

    • 54
    • 64

    Slight Chance Rain Showers

Today 15 Sep Mountains Southwestern Shasta County to Western Colusa County

Sunny, warmer. Highs 70 to 85 higher Elevations. 86 to 91 lower Elevations. Prevailing northwest Winds up to 10 Mph shifting to the east in the afternoon.

Tonight 15 Sep Mountains Southwestern Shasta County to Western Colusa County

Clear. Lows 55 to 67 higher Elevations. 63 to 71 lower Elevations. Light Winds becoming west up to 10 Mph after midnight.

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Saint John Mountain Temperature Statistics

September Temperature

Ukiah Municipal Airport (34.2 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    69.4 °F

  • Highest 2 September, 2025

    102.9 °F

Climate (2020–Present)

Ukiah Municipal Airport (34.2 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76.3 °F
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