Grinnell Lake Weather Forecast

    • 19
    • 38

    Mostly Sunny

    • 25
    • 43

    Mostly Sunny

    • 30
    • 48

    Mostly Sunny

    • 33
    • 52

    Mostly Sunny

    • 33
    • 53

    Partly Sunny

    • 33
    • 54

    Mostly Sunny

Today 18 May Upper San Joaquin River

Sunny. Highs 40 to 58. Northeast Winds 5 to 15 Mph. Gusts up to 45 Mph decreasing to 30 Mph in the afternoon.

Tonight 18 May Upper San Joaquin River

Mostly clear. Lows 24 to 38. Northeast Winds 5 to 10 Mph with Gusts to around 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

May Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 1 May, 2026

    30.2 °F

  • Average May

    54.8 °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

    45.9 °F

  • Average High 2021–2026

    60.7 °F
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