Grinnell Lake Weather Forecast

    • 17
    • 34

    Slight Chance Snow

    • 21
    • 38

    Mostly Sunny

    • 23
    • 42

    Mostly Sunny

    • 27
    • 46

    Partly Sunny

    • 27
    • 45

    Breezy

    • 24
    • 44

    Chance Snow Showers

    • 22
    • 39

    Chance Snow

Today 28 Apr Upper San Joaquin River

Not as cool. Sunny in the Morning, then partly sunny with a 20 percent chance of rain and snow in the afternoon. Highs 34 to 50. Southeast Winds up to 10 Mph shifting to the southwest in the afternoon.

Tonight 28 Apr Upper San Joaquin River

Mostly clear. Lows 21 to 33. Northwest Winds up to 10 Mph shifting to the northeast after midnight.

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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

    43.6 °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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