South Mountain Reservoir Weather Forecast

    • 39
    • 64

    Increasing Clouds

    • 40
    • 66

    Mostly Cloudy

    • 40
    • 65

    Rain Showers Likely

    • 31
    • 53

    Chance Rain Showers

    • 26
    • 50

    Mostly Sunny

    • 31
    • 54

    Chance Rain

    • 30
    • 55

    Partly Sunny

Today 19 Oct Modoc County

Partly cloudy in the morning then clearing. Highs in the lower 50s to lower 60s.

Tonight 19 Oct Modoc County

Mostly cloudy. Lows in the mid 30s to lower 40s. South 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

    56.8 °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

    64.8 °F
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