Grinnell Lake Weather Forecast

    • 30
    • 48

    Chance Snow

    • 33
    • 54

    Mostly Sunny

    • 32
    • 56

    Mostly Sunny

    • 33
    • 56

    Mostly Sunny

    • 37
    • 59

    Mostly Sunny

    • 40
    • 63

    Partly Sunny

Today 29 Jun Upper San Joaquin River

Sunny. Highs 48 to 64. Southwest Winds up to 15 Mph with Gusts to around 30 Mph.

Tonight 29 Jun Upper San Joaquin River

Partly cloudy with chance of snow and slight chance of rain in the Evening, then clear after midnight. Lows 33 to 45. North Winds up to 10 Mph shifting to the northeast after midnight. Chance of precipitation 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

June Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 8 June, 2026

    33.8 °F

  • Average June

    65 °F

  • Highest 16 June, 2026

    86 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
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