South Mountain Reservoir Weather Forecast

    • 41
    • 67

    Mostly Cloudy

    • 43
    • 67

    Rain Showers Likely

    • 31
    • 54

    Rain Showers Likely

    • 26
    • 51

    Mostly Sunny

    • 31
    • 58

    Mostly Sunny

    • 32
    • 58

    Partly Sunny

    • 31
    • 59

    Partly Sunny

Today 20 Oct Modoc County

Partly cloudy. Lows in the mid 20s to mid 30s. Highs in the mid 50s to lower 60s.

Tonight 20 Oct Modoc County

Mostly cloudy. Lows in the mid 30s to lower 40s. East Winds around 5 Mph.

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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

    55.6 °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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