South Mountain Reservoir Weather Forecast

    • 48
    • 86

    Sunny

    • 50
    • 87

    Mostly Sunny

    • 52
    • 88

    Mostly Sunny

    • 56
    • 89

    Mostly Cloudy

    • 55
    • 84

    Mostly Cloudy

    • 54
    • 86

    Partly Sunny

    • 54
    • 86

    Mostly Sunny

Today 16 Jul Modoc County

Sunny. Patchy smoke late this morning. Highs in the mid 80s to lower 90s. Southwest Winds 10 to 15 Mph.

Tonight 16 Jul Modoc County

Clear. Lows around 50. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph after Midnight, then shifting to the north 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

    68.8 °F

  • Highest 11 July, 2026

    95.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.7 °F
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