South Mountain Reservoir Weather Forecast

    • 50
    • 79

    Sunny

    • 52
    • 82

    Sunny

    • 55
    • 86

    Mostly Sunny

    • 53
    • 88

    Sunny

    • 53
    • 87

    Sunny

    • 52
    • 86

    Mostly Sunny

Today 13 Jun Modoc County

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

Tonight 13 Jun Modoc County

Clear. Lows in the lower to mid 50s. Northeast Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.1 °F

  • Average June

    59.5 °F

  • Highest 2 June, 2026

    83.6 °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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