South Mountain Reservoir Weather Forecast

    • 33
    • 60

    Mostly Sunny

    • 39
    • 65

    Mostly Sunny

    • 36
    • 67

    Sunny

    • 39
    • 73

    Sunny

    • 38
    • 71

    Mostly Sunny

    • 37
    • 68

    Mostly Sunny

    • 30
    • 55

    Chance Rain

Today 13 Oct Modoc County

Mostly cloudy in the morning then becoming partly cloudy. Chance of rain and snow. Highs in the mid 40s to lower 50s.

Tonight 13 Oct Modoc County

Mostly clear. Lows in the lower to mid 30s. North Winds around 5 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    59.7 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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