South Mountain Reservoir Weather Forecast

    • 31
    • 51

    Partly Sunny

    • 25
    • 44

    Mostly Cloudy

    • 30
    • 48

    Partly Sunny

    • 32
    • 53

    Mostly Cloudy

    • 30
    • 52

    Partly Sunny

    • 26
    • 46

    Chance Rain/Snow

Today 23 Nov Modoc County

Partly cloudy then becoming sunny late this morning then becoming partly cloudy. Patchy freezing fog early this morning. Highs in the lower to mid 50s. South Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 23 Nov Modoc County

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower to mid 30s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 21 November, 2025

    26.1 °F

  • Average November

    46.2 °F

  • Highest 1 November, 2025

    69.1 °F

Climate (2020–Present)

Alturas (22.4 miles)

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  • Average Low 2020–2025

    33.2 °F

  • Average 2020–2025

    49.2 °F

  • Average High 2020–2025

    64.3 °F
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