South Mountain Reservoir Weather Forecast

    • 53
    • 82

    Sunny

    • 55
    • 87

    Sunny

    • 53
    • 85

    Sunny

    • 52
    • 86

    Sunny

    • 50
    • 84

    Mostly Sunny

    • 46
    • 76

    Mostly Sunny

Today 21 Jun Modoc County

Sunny. Highs in the lower to mid 80s. North Winds around 5 Mph shifting to the northwest this afternoon.

Tonight 21 Jun Modoc County

Clear. Lows in the lower to mid 50s. Northwest Winds 5 to 10 Mph shifting to the north well after midnight.

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  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 10 June, 2026

    33.7 °F

  • Average June

    63.3 °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

    49.6 °F

  • Average High 2021–2026

    65 °F
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