Grinnell Lake Weather Forecast

    • 9
    • 27

    Decreasing Clouds

    • 19
    • 36

    Increasing Clouds

    • 18
    • 36

    Mostly Cloudy

    • 16
    • 31

    Snow Likely

    • 14
    • 29

    Chance Snow Showers

    • 16
    • 32

    Slight Chance Snow

    • 19
    • 35

    Chance Snow

Today 22 Apr Upper San Joaquin River

Mostly sunny. Chance of snow in the Morning, then chance of snow Showers and slight chance of Thunderstorms in the afternoon. Highs 27 to 41. Southwest Winds 5 to 15 Mph with Gusts to around 35 Mph. Chance of precipitation 30 percent.

Tonight 22 Apr Upper San Joaquin River

Colder. Partly cloudy. Lows 12 to 24. Northwest Winds up to 10 Mph with Gusts to around 30 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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