South Mountain Reservoir Weather Forecast

    • 38
    • 71

    Mostly Sunny

    • 37
    • 64

    Increasing Clouds

    • 39
    • 65

    Chance Rain

    • 38
    • 62

    Rain Likely

    • 31
    • 52

    Rain Likely

    • 27
    • 50

    Mostly Sunny

    • 30
    • 52

    Chance Rain/Snow

Today 18 Oct Modoc County

Mostly cloudy with a chance of rain and snow. Highs in the lower to mid 50s.

Tonight 18 Oct Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. South Winds 5 to 10 Mph shifting to the southeast well after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    56.4 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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