South Mountain Reservoir Weather Forecast

    • 47
    • 83

    Sunny

    • 39
    • 80

    Mostly Sunny

    • 31
    • 55

    Partly Sunny

    • 28
    • 51

    Mostly Sunny

    • 30
    • 54

    Mostly Sunny

    • 33
    • 58

    Partly Sunny

Today 8 Oct Modoc County

Sunny. Highs in the lower to mid 80s. East Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 8 Oct Modoc County

Clear. Lows in the mid 40s to lower 50s. North Winds around 5 Mph shifting to the south after midnight.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    67.8 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.7 °F
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