Hetch Hetchy Reservoir Weather Forecast

    • 55
    • 84

    Mostly Sunny

    • 57
    • 88

    Mostly Sunny

    • 59
    • 89

    Sunny

    • 58
    • 90

    Mostly Sunny

    • 56
    • 87

    Partly Sunny

    • 53
    • 83

    Chance Rain Showers

Today 14 Sep Yosemite NP outside of the valley

Sunny. Highs 58 to 70. Southwest Winds up to 10 Mph.

Tonight 14 Sep Yosemite NP outside of the valley

Mostly clear. Lows 38 to 52. West Winds up to 5 Mph shifting to the east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hetch Hetchy Reservoir Temperature Statistics

September Temperature

MCMWTC BRIDGEPORT (30.4 miles)

  • Lowest 10 September, 2025

    37 °F

  • Average September

    58.2 °F

  • Highest 1 September, 2025

    81 °F

Climate (2020–Present)

MCMWTC BRIDGEPORT (30.4 miles)

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  • Average Low 2020–2025

    29.3 °F

  • Average 2020–2025

    45.3 °F

  • Average High 2020–2025

    60.6 °F
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