South Mountain Reservoir Weather Forecast

    • 52
    • 90

    Areas Smoke

    • 50
    • 88

    Mostly Sunny

    • 50
    • 86

    Sunny

    • 52
    • 88

    Sunny

    • 55
    • 91

    Sunny

    • 54
    • 90

    Sunny

Today 31 Jul Modoc County

Sunny. Patchy smoke this morning. Highs in the mid 80s to mid 90s. Light Winds becoming south 5 to 10 Mph in the late morning and early Afternoon, then shifting to the southwest 10 to 15 Mph late this afternoon.

Tonight 31 Jul Modoc County

Clear. Lows in the lower to mid 50s. Southwest Winds 10 to 15 Mph decreasing to around 5 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

    69.4 °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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