South Mountain Reservoir Weather Forecast

    • 37
    • 59

    Mostly Sunny

    • 38
    • 61

    Decreasing Clouds

    • 41
    • 69

    Mostly Sunny

    • 41
    • 71

    Mostly Sunny

    • 44
    • 72

    Partly Sunny

    • 44
    • 71

    Partly Sunny

    • 43
    • 71

    Mostly Sunny

Today 27 Jun Modoc County

Mostly cloudy with a chance of rain this Morning, then partly cloudy with a chance of Showers and slight chance of Thunderstorms this afternoon. Snow level 7000 feet. Highs in the mid 50s to mid 60s. Northwest Winds 10 to 20 Mph. Chance of precipitation 30 percent.

Tonight 27 Jun Modoc County

Mostly clear then becoming partly cloudy after midnight then becoming mostly clear. Areas of frost well after midnight. Lows in the mid 30s to lower 40s. Northwest Winds 10 to 20 Mph decreasing to 5 to 10 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.7 °F

  • Average June

    63.5 °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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