Grinnell Lake Weather Forecast

    • 19
    • 31

    Snow Likely

    • 21
    • 31

    Snow Showers

    • 24
    • 38

    Slight Chance Thunderstorms

    • 27
    • 44

    Mostly Sunny

    • 30
    • 48

    Mostly Sunny

    • 34
    • 51

    Partly Sunny

Today 27 May Upper San Joaquin River

Snow Showers and slight chance of Thunderstorms through the day. Rain Showers in the afternoon. Snow accumulation up to 2 Inches. Highs 30 to 44. Southwest Winds up to 10 Mph with Gusts to around 25 Mph. Chance of precipitation 90 percent.

Tonight 27 May Upper San Joaquin River

Mostly cloudy. Snow Showers likely with possible rain and Thunderstorms in the Evening, then chance of snow after midnight. Snow accumulation up to 2 Inches. Snow level 7000 feet. Lows 22 to 34. Southwest Winds up to 5 Mph shifting to the south after midnight. Chance of precipitation 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

May Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 18 May, 2026

    19.4 °F

  • Average May

    53.5 °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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