South Mountain Reservoir Weather Forecast

    • 54
    • 88

    Increasing Clouds

    • 52
    • 89

    Mostly Sunny

    • 53
    • 88

    Mostly Sunny

    • 54
    • 89

    Partly Sunny

    • 49
    • 81

    Chance Rain

    • 48
    • 78

    Mostly Sunny

Today 15 Jun Modoc County

Sunny. Highs in the mid 80s to mid 90s. North Winds 5 to 10 Mph shifting to the northwest late this afternoon.

Tonight 15 Jun Modoc County

Partly cloudy. Lows in the mid 50s to lower 60s. North Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.7 °F

  • Average June

    60.1 °F

  • Highest 12 June, 2026

    88.6 °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

    65 °F
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