South Mountain Reservoir Weather Forecast

    • 54
    • 91

    Patchy Smoke

    • 55
    • 93

    Sunny

    • 54
    • 94

    Sunny

    • 54
    • 93

    Sunny

    • 55
    • 93

    Sunny

    • 53
    • 89

    Mostly Sunny

Today 4 Aug Modoc County

Sunny. Patchy smoke until early afternoon. Highs in the lower to mid 90s. Northeast Winds 5 to 10 Mph shifting to the west this afternoon.

Tonight 4 Aug Modoc County

Mostly clear. Patchy smoke after midnight. Lows in the mid 50s to lower 60s. Northwest Winds 5 to 10 Mph shifting to the northeast well after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 1 August, 2026

    46.7 °F

  • Average August

    71.6 °F

  • Highest 1 August, 2026

    95.6 °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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