South Mountain Reservoir Weather Forecast

    • 51
    • 81

    Sunny

    • 49
    • 79

    Sunny

    • 51
    • 82

    Sunny

    • 54
    • 86

    Mostly Sunny

    • 52
    • 87

    Sunny

    • 51
    • 86

    Sunny

Today 12 Jun Modoc County

Sunny. Highs in the lower to mid 80s. North Winds 10 to 15 Mph.

Tonight 12 Jun Modoc County

Clear. Lows around 50. Northwest Winds 10 to 15 Mph shifting to the north well after midnight.

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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 °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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