South Mountain Reservoir Weather Forecast

    • 50
    • 83

    Increasing Clouds

    • 50
    • 85

    Slight Chance Thunderstorms

    • 49
    • 84

    Partly Sunny

    • 49
    • 84

    Mostly Sunny

    • 47
    • 83

    Mostly Sunny

    • 48
    • 83

    Mostly Sunny

Today 23 Aug Modoc County

Sunny in the morning then becoming partly cloudy. Highs in the lower to mid 80s. Northeast Winds around 5 Mph shifting to the southwest in the afternoon.

Tonight 23 Aug Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. North Winds around 5 Mph.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 16 August, 2026

    38.6 °F

  • Average August

    70.5 °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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