Grinnell Lake Weather Forecast

    • 24
    • 43

    Becoming Sunny

    • 27
    • 44

    Increasing Clouds

    • 27
    • 43

    Slight Chance Thunderstorms

    • 21
    • 41

    Chance Snow

    • 21
    • 33

    Snow Showers Likely

    • 23
    • 34

    Chance Snow

    • 28
    • 43

    Slight Chance Thunderstorms

Today 30 Apr Upper San Joaquin River

Not as cool. Sunny. Highs 44 to 62. Northeast Winds up to 10 Mph shifting to the northwest in the afternoon.

Tonight 30 Apr Upper San Joaquin River

Partly cloudy in the evening then becoming clear. Lows 27 to 41. North Winds up to 10 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

    43.6 °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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