South Mountain Reservoir Weather Forecast

    • 40
    • 70

    Patchy Smoke

    • 45
    • 59

    Rain

    • 36
    • 58

    Rain

    • 34
    • 59

    Chance Rain

    • 36
    • 65

    Slight Chance Rain

    • 38
    • 67

    Slight Chance Rain

Today 1 Sep Modoc County

Sunny until early afternoon then becoming partly cloudy. Patchy smoke through the day. Highs in the mid 60s to lower 70s. Southwest Winds 15 to 20 Mph.

Tonight 1 Sep Modoc County

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 30s to mid 40s. Southwest Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

September Temperature

Alturas (22.4 miles)

  • Lowest

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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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