South Mountain Reservoir Weather Forecast

    • 44
    • 75

    Sunny

    • 43
    • 75

    Partly Sunny

    • 36
    • 65

    Mostly Sunny

    • 43
    • 67

    Partly Sunny

    • 41
    • 63

    Slight Chance Rain

    • 39
    • 63

    Slight Chance Rain

    • 38
    • 62

    Mostly Sunny

Today 4 Jun Modoc County

Sunny. Highs in the mid 70s to lower 80s. Northwest Winds 5 to 10 Mph.

Tonight 4 Jun Modoc County

Clear. Lows in the mid 40s to lower 50s. Northwest Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 2 June, 2026

    37.9 °F

  • Average June

    63.8 °F

  • Highest 2 June, 2026

    82.9 °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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