South Mountain Reservoir Weather Forecast

    • 25
    • 50

    Breezy

    • 25
    • 49

    Mostly Sunny

    • 32
    • 60

    Mostly Sunny

    • 36
    • 67

    Sunny

    • 39
    • 71

    Sunny

    • 39
    • 75

    Mostly Sunny

Today 11 Oct Modoc County

Partly cloudy early this morning then clearing. Highs in the mid 40s to mid 50s. Northeast Winds 10 to 20 Mph.

Tonight 11 Oct Modoc County

Mostly clear. Lows in the lower 20s to lower 30s. North Winds 10 to 20 Mph decreasing to 5 to 10 Mph well after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    64.8 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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