South Mountain Reservoir Weather Forecast

    • 53
    • 83

    Becoming Sunny

    • 45
    • 80

    Slight Chance Thunderstorms

    • 41
    • 76

    Mostly Sunny

    • 43
    • 75

    Sunny

    • 41
    • 77

    Mostly Sunny

    • 39
    • 71

    Mostly Sunny

Today 27 Aug Modoc County

Mostly cloudy early this morning then clearing. Highs in the lower to mid 80s. Southeast Winds around 5 Mph increasing to southwest 10 to 20 Mph in the late morning and afternoon.

Tonight 27 Aug Modoc County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 50s. Southwest Winds 10 to 20 Mph decreasing to 5 to 10 Mph late in the Evening, then shifting to the southeast after midnight.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 16 August, 2026

    38.6 °F

  • Average August

    70.1 °F

  • Highest 7 August, 2026

    101.6 °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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