Union Reservoir Weather Forecast

    • 38
    • 61

    Becoming Sunny

    • 46
    • 70

    Sunny

    • 48
    • 78

    Mostly Sunny

    • 50
    • 76

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 50
    • 78

    Mostly Sunny

Today 17 Sep Sierra Nevada of Calaveras-Tuolumne-Southern Alpine Counties Above 5000 ft

Mostly sunny. Highs 53 to 63. South Winds 10 to 15 Mph with Gusts to around 30 Mph.

Tonight 17 Sep Sierra Nevada of Calaveras-Tuolumne-Southern Alpine Counties Above 5000 ft

Clear. Lows 35 to 45. Southwest Winds up to 10 Mph with Gusts to around 20 Mph shifting to the east after midnight.

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Union Reservoir Temperature Statistics

September Temperature

MCMWTC BRIDGEPORT (26.1 miles)

  • Lowest 14 September, 2026

    27 °F

  • Average September

    58.1 °F

  • Highest 9 September, 2026

    84 °F

Climate (2021–2026)

MCMWTC BRIDGEPORT (26.1 miles)

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  • Average Low 2021–2026

    29.9 °F

  • Average 2021–2026

    45.6 °F

  • Average High 2021–2026

    60.5 °F
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