South Mountain Reservoir Weather Forecast

    • 25
    • 44

    Gradual Clearing

    • 25
    • 46

    Mostly Sunny

    • 31
    • 50

    Partly Sunny

    • 28
    • 46

    Partly Sunny

    • 26
    • 45

    Slight Chance Rain/Snow

    • 25
    • 45

    Partly Sunny

Today 27 Oct Modoc County

Mostly cloudy this Morning, then partly cloudy with a 10 percent chance of rain this afternoon. Highs in the lower 40s to lower 50s. Southwest Winds around 5 Mph shifting to the west 10 to 15 Mph this afternoon.

Tonight 27 Oct Modoc County

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 20s to lower 30s. Northwest Winds 5 to 10 Mph shifting to the northeast well after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 12 October, 2026

    15.7 °F

  • Average October

    52.7 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.9 °F
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