South Mountain Reservoir Weather Forecast

    • 50
    • 88

    Areas Smoke

    • 52
    • 88

    Increasing Clouds

    • 57
    • 89

    Mostly Cloudy

    • 56
    • 87

    Mostly Cloudy

    • 55
    • 86

    Slight Chance Rain

    • 55
    • 88

    Slight Chance Rain

    • 54
    • 89

    Mostly Sunny

Today 17 Jul Modoc County

Sunny. Patchy smoke late this morning. Highs in the mid 80s to lower 90s. Southwest Winds 10 to 20 Mph.

Tonight 17 Jul Modoc County

Clear. Haze early this evening. Haze well after midnight. Lows in the lower to mid 50s. Southwest Winds 10 to 20 Mph becoming south around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    69.2 °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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