South Mountain Reservoir Weather Forecast

    • 43
    • 83

    Increasing Clouds

    • 41
    • 71

    Partly Sunny

    • 45
    • 61

    Chance Rain

    • 37
    • 60

    Chance Rain

    • 35
    • 63

    Slight Chance Rain

    • 38
    • 68

    Mostly Sunny

Today 31 Aug Modoc County

Sunny. Patchy smoke this afternoon. Highs in the lower to mid 80s. Southeast Winds 5 to 10 Mph shifting to the southwest 10 to 20 Mph this afternoon.

Tonight 31 Aug Modoc County

Partly cloudy. Patchy smoke through the night. Lows in the mid 40s to lower 50s. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 16 August, 2026

    38.6 °F

  • Average August

    69.2 °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

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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