South Mountain Reservoir Weather Forecast

    • 45
    • 77

    Mostly Sunny

    • 43
    • 81

    Mostly Sunny

    • 40
    • 71

    Mostly Sunny

    • 39
    • 62

    Chance Rain

    • 38
    • 63

    Chance Rain

    • 37
    • 66

    Chance Rain

Today 30 Aug Modoc County

Sunny. Highs in the mid 70s to lower 80s. Northeast Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 30 Aug Modoc County

Clear. Lows in the mid 40s to lower 50s. West Winds 5 to 10 Mph shifting to the southeast 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

    69.2 °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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