South Mountain Reservoir Weather Forecast

    • 24
    • 47

    Mostly Sunny

    • 33
    • 59

    Mostly Sunny

    • 37
    • 66

    Mostly Sunny

    • 39
    • 70

    Sunny

    • 39
    • 74

    Mostly Sunny

    • 39
    • 73

    Mostly Sunny

    • 38
    • 70

    Mostly Sunny

Today 12 Oct Modoc County

Sunny. Highs in the mid 40s to lower 50s. North Winds 10 to 15 Mph.

Tonight 12 Oct Modoc County

Mostly clear. Lows in the lower to mid 20s. North Winds 5 to 10 Mph.

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  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    62.3 °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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