South Mountain Reservoir Weather Forecast

    • 50
    • 83

    Increasing Clouds

    • 50
    • 83

    Mostly Cloudy

    • 51
    • 83

    Partly Sunny

    • 52
    • 85

    Mostly Sunny

    • 52
    • 86

    Partly Sunny

    • 48
    • 82

    Partly Sunny

    • 47
    • 79

    Mostly Sunny

Today 16 Aug Modoc County

Partly cloudy then becoming sunny in the late morning and early afternoon then becoming partly cloudy. Highs in the lower to mid 80s. Light Winds becoming southwest 5 to 10 Mph in the late morning and afternoon.

Tonight 16 Aug Modoc County

Mostly cloudy. Lows in the lower to mid 50s. Southwest Winds 5 to 10 Mph shifting to the south after Midnight, then becoming light well after midnight.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    71.2 °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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