South Mountain Reservoir Weather Forecast

    • 46
    • 76

    Slight Chance Thunderstorms

    • 48
    • 79

    Sunny

    • 53
    • 84

    Sunny

    • 54
    • 88

    Sunny

    • 53
    • 86

    Sunny

    • 50
    • 85

    Mostly Sunny

Today 20 Jun Modoc County

Partly cloudy then becoming sunny in the late morning and early afternoon then becoming partly cloudy. A 20 percent chance of Thunderstorms this afternoon. Highs in the lower to mid 70s. Southwest Winds 10 to 15 Mph.

Tonight 20 Jun Modoc County

Mostly clear. Slight chance of Thunderstorms in the evening. Lows in the mid 40s to lower 50s. West Winds 10 to 15 Mph shifting to the north around 5 Mph well 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

    63.3 °F

  • Highest 16 June, 2026

    95.6 °F

Climate (2021–2026)

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

    65 °F
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