South Mountain Reservoir Weather Forecast

    • 37
    • 60

    Partly Sunny

    • 42
    • 69

    Decreasing Clouds

    • 41
    • 72

    Sunny

    • 43
    • 72

    Mostly Sunny

    • 45
    • 75

    Partly Sunny

    • 47
    • 77

    Mostly Sunny

    • 50
    • 84

    Mostly Sunny

Today 28 Jun Modoc County

Partly cloudy. Patchy frost early this morning. Highs in the lower to mid 60s. North Winds 5 to 10 Mph.

Tonight 28 Jun Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. North Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.7 °F

  • Average June

    63.3 °F

  • Highest 18 June, 2026

    96.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    64.9 °F
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