South Mountain Reservoir Weather Forecast

    • 50
    • 84

    Increasing Clouds

    • 50
    • 84

    Mostly Cloudy

    • 49
    • 82

    Partly Sunny

    • 46
    • 82

    Mostly Sunny

    • 43
    • 79

    Mostly Sunny

    • 45
    • 79

    Mostly Sunny

Today 25 Aug Modoc County

Partly cloudy. Highs in the lower to mid 80s. Southeast Winds 10 to 15 Mph shifting to the southwest in the afternoon.

Tonight 25 Aug Modoc County

Partly cloudy. Lows in the lower to mid 50s. Southwest Winds 10 to 15 Mph shifting to the south around 5 Mph in the late evening and early Morning, then shifting to the southeast well after midnight.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 16 August, 2026

    38.6 °F

  • Average August

    69.8 °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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