South Mountain Reservoir Weather Forecast

    • 34
    • 65

    Becoming Sunny

    • 39
    • 70

    Sunny

    • 46
    • 77

    Sunny

    • 50
    • 82

    Sunny

    • 52
    • 85

    Sunny

    • 53
    • 86

    Sunny

Today 9 Jun Modoc County

Mostly cloudy then becoming partly cloudy late this morning then becoming sunny. Highs in the mid 60s to lower 70s. West Winds 10 to 15 Mph.

Tonight 9 Jun Modoc County

Clear. Areas of frost after midnight. Lows in the mid 30s to lower 40s. Northwest Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 1 June, 2026

    37.7 °F

  • Average June

    60.9 °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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