South Mountain Reservoir Weather Forecast

    • 38
    • 64

    Increasing Clouds

    • 41
    • 67

    Mostly Cloudy

    • 39
    • 67

    Rain Likely

    • 32
    • 50

    Rain/Snow

    • 29
    • 45

    Rain

    • 31
    • 52

    Chance Rain

    • 34
    • 57

    Slight Chance Rain

Today 18 Apr Modoc County

Partly cloudy early this morning then clearing. Highs in the lower to mid 60s. Southeast Winds 5 to 10 Mph shifting to the southwest this afternoon.

Tonight 18 Apr Modoc County

Partly cloudy early this evening then becoming mostly cloudy. Lows around 40. Southwest Winds 5 to 10 Mph shifting to the southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

April Temperature

Alturas (22.4 miles)

  • Lowest 3 April, 2026

    17.7 °F

  • Average April

    44.7 °F

  • Highest 5 April, 2026

    73.7 °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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