South Mountain Reservoir Weather Forecast

    • 49
    • 81

    Mostly Sunny

    • 47
    • 79

    Mostly Sunny

    • 47
    • 80

    Mostly Sunny

    • 49
    • 82

    Partly Sunny

    • 48
    • 81

    Partly Sunny

    • 48
    • 79

    Partly Sunny

    • 47
    • 78

    Partly Sunny

Today 13 Aug Modoc County

Sunny. Highs in the mid 70s to mid 80s. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph this afternoon.

Tonight 13 Aug Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. Southwest Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    72.9 °F

  • Highest 7 August, 2026

    101.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.8 °F
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