South Mountain Reservoir Weather Forecast

    • 50
    • 85

    Mostly Sunny

    • 52
    • 86

    Mostly Sunny

    • 51
    • 83

    Sunny

    • 49
    • 83

    Partly Sunny

    • 43
    • 70

    Slight Chance Thunderstorms

    • 37
    • 63

    Mostly Sunny

    • 39
    • 64

    Mostly Sunny

Today 22 Jun Modoc County

Sunny. Highs in the lower 80s to lower 90s. North Winds around 5 Mph shifting to the northwest this afternoon.

Tonight 22 Jun Modoc County

Mostly clear. Lows in the lower 50s to lower 60s. West Winds 5 to 10 Mph shifting to the south 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 °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

    49.6 °F

  • Average High 2021–2026

    64.9 °F
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