South Mountain Reservoir Weather Forecast

    • 53
    • 90

    Sunny

    • 55
    • 88

    Partly Sunny

    • 52
    • 87

    Mostly Cloudy

    • 46
    • 82

    Sunny

    • 48
    • 82

    Mostly Sunny

    • 49
    • 83

    Mostly Sunny

    • 48
    • 83

    Mostly Sunny

Today 19 Aug Modoc County

Sunny. Highs in the mid 80s to mid 90s. Southwest Winds around 5 Mph increasing to 10 to 15 Mph late this afternoon.

Tonight 19 Aug Modoc County

Clear. Lows in the lower to mid 50s. Southwest Winds 10 to 15 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 °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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