South Mountain Reservoir Weather Forecast

    • 39
    • 72

    Increasing Clouds

    • 39
    • 71

    Increasing Clouds

    • 35
    • 61

    Mostly Cloudy

    • 37
    • 62

    Mostly Cloudy

    • 38
    • 63

    Chance Rain

    • 35
    • 56

    Chance Rain

    • 30
    • 53

    Partly Sunny

Today 17 Oct Modoc County

Mostly cloudy with a slight chance of rain and snow in the Morning, then partly cloudy with a slight chance of rain in the afternoon. Highs in the lower to mid 50s.

Tonight 17 Oct Modoc County

Partly cloudy until well after midnight then clearing. Lows in the mid 30s to lower 40s. West Winds 5 to 10 Mph shifting to the southeast 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

    56.1 °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

    64.8 °F
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