South Mountain Reservoir Weather Forecast

    • 32
    • 58

    Decreasing Clouds

    • 36
    • 64

    Partly Sunny

    • 33
    • 57

    Mostly Cloudy

    • 33
    • 54

    Partly Sunny

    • 35
    • 59

    Partly Sunny

    • 36
    • 62

    Mostly Cloudy

    • 35
    • 57

    Chance Rain

Today 6 Nov Modoc County

Mostly cloudy early this morning then becoming partly cloudy. Highs in the mid 50s to mid 60s. Southeast Winds around 5 Mph.

Tonight 6 Nov Modoc County

Partly cloudy. Lows in the lower to mid 30s. Southeast Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

November Temperature

Alturas (22.4 miles)

  • Lowest 1 November, 2026

    23.6 °F

  • Average November

    40.8 °F

  • Highest 2 November, 2026

    55.9 °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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