South Mountain Reservoir Weather Forecast

    • 29
    • 55

    Decreasing Clouds

    • 29
    • 50

    Mostly Cloudy

    • 28
    • 47

    Rain Showers Likely

    • 25
    • 45

    Partly Sunny

    • 31
    • 51

    Partly Sunny

    • 31
    • 56

    Partly Sunny

Today 29 Oct Modoc County

Mostly cloudy. Highs in the mid 50s to lower 60s. Southeast Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 29 Oct Modoc County

Mostly cloudy. Lows in the mid 20s to mid 30s. Southwest Winds 5 to 10 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

    51.5 °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

    64.9 °F
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