South Mountain Reservoir Weather Forecast

    • 46
    • 83

    Mostly Sunny

    • 49
    • 83

    Mostly Sunny

    • 50
    • 84

    Mostly Sunny

    • 48
    • 84

    Mostly Sunny

    • 46
    • 82

    Mostly Sunny

    • 46
    • 82

    Mostly Sunny

Today 22 Aug Modoc County

Sunny. Highs in the lower to mid 80s. South Winds 5 to 10 Mph shifting to the southwest 10 to 20 Mph with Gusts to around 35 Mph in the afternoon.

Tonight 22 Aug Modoc County

Mostly clear. Lows in the mid 40s to lower 50s. Breezy. Southwest Winds 20 to 25 Mph becoming west 5 to 10 Mph in the late evening and early Morning, then becoming light 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

    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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