Grinnell Lake Weather Forecast

    • 44
    • 64

    Increasing Clouds

    • 46
    • 64

    Partly Sunny

    • 47
    • 64

    Partly Sunny

    • 46
    • 62

    Slight Chance Thunderstorms

    • 46
    • 61

    Chance Rain Showers

    • 46
    • 63

    Chance Thunderstorms

    • 46
    • 63

    Chance Rain Showers

Today 17 Jul Upper San Joaquin River

Sunny. Highs 64 to 78. Southwest Winds up to 15 Mph. Gusts up to 30 Mph in the afternoon.

Tonight 17 Jul Upper San Joaquin River

Mostly clear. Lows 47 to 57. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

July Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 4 July, 2026

    39.2 °F

  • Average July

    66.2 °F

  • Highest 10 July, 2026

    87.8 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    60.6 °F
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