South Mountain Reservoir Weather Forecast

    • 41
    • 71

    Sunny

    • 46
    • 78

    Sunny

    • 49
    • 82

    Sunny

    • 50
    • 81

    Sunny

    • 50
    • 81

    Sunny

    • 52
    • 83

    Mostly Sunny

Today 10 Jun Modoc County

Sunny. Areas of frost early this morning. Highs in the lower to mid 70s. Northwest Winds 10 to 15 Mph.

Tonight 10 Jun Modoc County

Clear. Lows in the lower to mid 40s. North Winds 10 to 15 Mph shifting to the northeast 5 to 10 Mph well after midnight.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 1 June, 2026

    37.7 °F

  • Average June

    59.1 °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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