South Mountain Reservoir Weather Forecast

    • 40
    • 72

    Becoming Sunny

    • 44
    • 75

    Mostly Sunny

    • 42
    • 76

    Mostly Sunny

    • 37
    • 65

    Mostly Sunny

    • 42
    • 68

    Partly Sunny

    • 42
    • 67

    Mostly Cloudy

    • 41
    • 68

    Partly Sunny

Today 3 Jun Modoc County

Mostly clear. Lows in the mid 30s to mid 40s. Northwest Winds 10 to 20 Mph decreasing to 5 to 10 Mph after midnight.

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  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 1 June, 2026

    39 °F

  • Average June

    59 °F

  • Highest 1 June, 2026

    75.9 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    64.9 °F
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