South Mountain Reservoir Weather Forecast

    • 50
    • 80

    Increasing Clouds

    • 43
    • 67

    Chance Rain

    • 35
    • 57

    Slight Chance Rain

    • 38
    • 61

    Mostly Sunny

    • 41
    • 69

    Mostly Sunny

    • 43
    • 72

    Mostly Sunny

    • 45
    • 73

    Mostly Sunny

Today 25 Jun Modoc County

Sunny until early afternoon then becoming partly cloudy. Highs in the mid 70s to mid 80s. North Winds around 5 Mph shifting to the southwest late this Morning, then increasing to 10 to 20 Mph this afternoon.

Tonight 25 Jun Modoc County

Mostly cloudy. A 30 percent chance of Showers well after midnight. Lows in the lower to mid 50s. West Winds 10 to 20 Mph decreasing to 5 to 10 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.7 °F

  • Average June

    63 °F

  • Highest 18 June, 2026

    96.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    64.9 °F
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