South Mountain Reservoir Weather Forecast

    • 53
    • 86

    Mostly Sunny

    • 53
    • 89

    Mostly Sunny

    • 54
    • 88

    Partly Sunny

    • 50
    • 84

    Partly Sunny

    • 47
    • 81

    Sunny

    • 50
    • 83

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

Today 18 Aug Modoc County

Sunny. Highs in the mid 80s to lower 90s. West Winds 5 to 10 Mph.

Tonight 18 Aug Modoc County

Mostly clear. Lows in the lower to mid 50s. Northwest Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 15 August, 2026

    39.7 °F

  • Average August

    70.3 °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

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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