South Mountain Reservoir Weather Forecast

    • 36
    • 65

    Mostly Sunny

    • 43
    • 65

    Partly Sunny

    • 41
    • 63

    Chance Rain

    • 38
    • 63

    Chance Rain

    • 38
    • 63

    Sunny

    • 41
    • 68

    Sunny

Today 6 Jun Modoc County

Partly cloudy in the morning then clearing. Highs in the lower 60s to lower 70s. Northwest Winds 10 to 15 Mph. Gusts up to 30 Mph late in the afternoon.

Tonight 6 Jun Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. Northwest Winds 10 to 20 Mph with Gusts to around 35 Mph shifting to the north 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

    61.4 °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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