South Mountain Reservoir Weather Forecast

    • 39
    • 59

    Decreasing Clouds

    • 42
    • 64

    Mostly Sunny

    • 39
    • 61

    Chance Rain Showers

    • 42
    • 64

    Mostly Sunny

    • 44
    • 73

    Partly Sunny

    • 46
    • 76

    Partly Sunny

Today 4 Sep Modoc County

Mostly cloudy then becoming partly cloudy late this morning then becoming sunny. A 10 percent chance of rain Showers. Highs in the mid 50s to lower 60s. Southwest Winds 10 to 15 Mph.

Tonight 4 Sep Modoc County

Mostly clear. Lows around 40. Southwest Winds 5 to 10 Mph shifting to the southeast well after midnight.

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South Mountain Reservoir Temperature Statistics

September Temperature

Alturas (22.4 miles)

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  • Average September

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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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