Grinnell Lake Weather Forecast

    • 33
    • 51

    Increasing Clouds

    • 32
    • 50

    Slight Chance Thunderstorms

    • 33
    • 52

    Mostly Sunny

    • 33
    • 52

    Partly Sunny

    • 31
    • 51

    Slight Chance Thunderstorms

    • 25
    • 46

    Windy

Today 21 May Upper San Joaquin River

Sunny. Highs 51 to 69. Northwest Winds up to 5 Mph shifting to the west 5 to 15 Mph in the afternoon.

Tonight 21 May Upper San Joaquin River

Mostly clear. Lows 36 to 48. Northwest Winds up to 10 Mph shifting to the east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

May Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 18 May, 2026

    19.4 °F

  • Average May

    53.4 °F

  • Highest 10 May, 2026

    78.8 °F

Climate (2021–Present)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.6 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.7 °F
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