South Mountain Reservoir Weather Forecast

    • 53
    • 88

    Smoke

    • 52
    • 88

    Mostly Sunny

    • 53
    • 90

    Sunny

    • 51
    • 86

    Sunny

    • 51
    • 85

    Sunny

    • 53
    • 88

    Sunny

Today 29 Jul Modoc County

Sunny. Smoke this morning. Highs in the mid 80s to lower 90s. Northeast Winds around 5 Mph shifting to the southwest 10 to 15 Mph in the late morning and afternoon.

Tonight 29 Jul Modoc County

Clear. Lows in the lower to mid 50s. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph well after midnight.

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South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    69.7 °F

  • Highest 24 July, 2026

    97.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.8 °F
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