Hetch Hetchy Reservoir Weather Forecast

    • 50
    • 80

    Becoming Sunny

    • 53
    • 84

    Mostly Sunny

    • 53
    • 84

    Mostly Sunny

    • 53
    • 86

    Mostly Sunny

    • 53
    • 85

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

Today 20 May Yosemite NP outside of the valley

Sunny in the morning then becoming partly sunny. Southeast Winds up to 5 Mph shifting to the west in the afternoon.

Tonight 20 May Yosemite NP outside of the valley

Mostly clear. Lows 31 to 47. Northwest Winds up to 10 Mph shifting to the east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hetch Hetchy Reservoir Temperature Statistics

May Temperature

MCMWTC BRIDGEPORT (30.4 miles)

  • Lowest 18 May, 2026

    24.1 °F

  • Average May

    51 °F

  • Highest 11 May, 2026

    78.1 °F

Climate (2021–Present)

MCMWTC BRIDGEPORT (30.4 miles)

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  • Average Low 2021–2026

    30 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    60.7 °F
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