South Mountain Reservoir Weather Forecast

    • 55
    • 88

    Patchy Smoke

    • 55
    • 86

    Mostly Cloudy

    • 54
    • 82

    Mostly Cloudy

    • 53
    • 84

    Chance Rain Showers

    • 53
    • 88

    Mostly Sunny

    • 53
    • 89

    Mostly Sunny

Today 11 Jul Modoc County

Sunny until early afternoon then becoming partly cloudy. Highs in the mid 80s to lower 90s. South Winds 10 to 15 Mph with Gusts to around 30 Mph shifting to the southwest 15 to 20 Mph late this afternoon.

Tonight 11 Jul Modoc County

Partly cloudy in the evening then becoming mostly cloudy. Patchy smoke after midnight. Lows in the mid 50s to lower 60s. Southwest Winds 10 to 20 Mph shifting to the northwest 5 to 10 Mph 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

    67.9 °F

  • Highest 4 July, 2026

    93.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.8 °F
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