Grinnell Lake Weather Forecast

    • 35
    • 57

    Increasing Clouds

    • 30
    • 50

    Breezy

    • 34
    • 52

    Mostly Sunny

    • 31
    • 53

    Mostly Sunny

    • 27
    • 49

    Breezy

    • 28
    • 50

    Mostly Sunny

Today 12 May Upper San Joaquin River

Sunny. Highs 57 to 77. South Winds up to 10 Mph with Gusts to around 35 Mph shifting to the southwest with Gusts to around 45 Mph in the afternoon.

Tonight 12 May Upper San Joaquin River

Mostly cloudy in the evening then becoming partly cloudy. Lows 40 to 52. Southwest Winds up to 10 Mph. Gusts up to 35 Mph decreasing to 20 Mph 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 1 May, 2026

    30.2 °F

  • Average May

    50.7 °F

  • Highest 9 May, 2026

    75.2 °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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