South Mountain Reservoir Weather Forecast

    • 38
    • 72

    Sunny

    • 44
    • 73

    Mostly Sunny

    • 48
    • 78

    Mostly Sunny

    • 49
    • 80

    Sunny

    • 52
    • 86

    Mostly Sunny

    • 53
    • 87

    Partly Sunny

    • 52
    • 86

    Mostly Sunny

Today 30 Jun Modoc County

Sunny. Highs in the lower to mid 70s. Northwest Winds around 5 Mph increasing to 10 to 15 Mph this afternoon.

Tonight 30 Jun Modoc County

Clear. Lows around 40. Northwest Winds 10 to 15 Mph with Gusts to around 30 Mph shifting to the north around 5 Mph well 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

    62.5 °F

  • Highest 18 June, 2026

    96.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    64.8 °F
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