Grinnell Lake Weather Forecast

    • 43
    • 61

    Slight Chance Thunderstorms

    • 43
    • 63

    Mostly Sunny

    • 45
    • 66

    Mostly Sunny

    • 45
    • 67

    Partly Sunny

    • 43
    • 65

    Slight Chance Thunderstorms

    • 38
    • 60

    Slight Chance Thunderstorms

Today 14 Jun Upper San Joaquin River

Sunny. Slight chance of rain late in the morning. Slight chance of Thunderstorms in the afternoon. Highs 60 to 76. Southwest Winds up to 10 Mph. Chance of precipitation 20 percent.

Tonight 14 Jun Upper San Joaquin River

Mostly clear. Lows 44 to 56. West Winds up to 5 Mph shifting to the northeast after midnight.

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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

    63.5 °F

  • Highest 12 June, 2026

    84.2 °F

Climate (2021–Present)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.6 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.7 °F
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