South Mountain Reservoir Weather Forecast

    • 41
    • 64

    Increasing Clouds

    • 43
    • 61

    Rain Showers Likely

    • 37
    • 65

    Chance Rain Showers

    • 40
    • 69

    Sunny

    • 43
    • 72

    Sunny

    • 45
    • 77

    Sunny

Today 7 Jun Modoc County

Sunny then becoming partly cloudy early this afternoon then becoming mostly cloudy. Areas of frost early this morning. Highs in the lower 60s to lower 70s. Northeast Winds around 5 Mph shifting to the west 10 to 15 Mph late this afternoon.

Tonight 7 Jun Modoc County

Mostly cloudy. Lows in the lower to mid 40s. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph in the late evening and early Morning, then shifting to the southwest well after midnight.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 1 June, 2026

    37.7 °F

  • Average June

    61.4 °F

  • Highest 2 June, 2026

    83.6 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    64.9 °F
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