Grinnell Lake Weather Forecast

    • 28
    • 51

    Mostly Sunny

    • 26
    • 46

    Mostly Sunny

    • 17
    • 41

    Breezy

    • 22
    • 41

    Mostly Sunny

    • 26
    • 47

    Mostly Sunny

    • 30
    • 51

    Mostly Sunny

Today 15 May Upper San Joaquin River

Sunny. Highs 51 to 69. Southwest Winds up to 10 Mph shifting to the west in the afternoon. Gusts up to 30 Mph.

Tonight 15 May Upper San Joaquin River

Mostly clear. Lows 31 to 43. Southwest Winds up to 10 Mph. Gusts up to 30 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

    53.8 °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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