Grinnell Lake Weather Forecast

    • 19
    • 37

    Mostly Cloudy

    • 8
    • 33

    Mostly Sunny

    • 19
    • 37

    Mostly Sunny

    • 22
    • 40

    Partly Sunny

    • 22
    • 42

    Breezy

    • 20
    • 38

    Chance Snow

    • 17
    • 34

    Chance Snow

Today 15 Apr Upper San Joaquin River

Not as cool. Mostly sunny. Highs 36 to 52. Southwest Winds up to 10 Mph with Gusts to around 30 Mph.

Tonight 15 Apr Upper San Joaquin River

Mostly cloudy early in the evening then becoming partly cloudy. Lows 22 to 32. Southwest Winds up to 10 Mph with Gusts to around 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

April Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 4 April, 2026

    14 °F

  • Average April

    43.8 °F

  • Highest 7 April, 2026

    68 °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

    60.8 °F
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