Grinnell Lake Weather Forecast

    • 48
    • 71

    Mostly Sunny

    • 49
    • 71

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 49
    • 71

    Partly Sunny

    • 47
    • 69

    Mostly Sunny

    • 45
    • 67

    Slight Chance Thunderstorms

Today 5 Aug Upper San Joaquin River

Sunny. Highs 70 to 84. South Winds up to 5 Mph shifting to the southwest 5 to 15 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 5 Aug Upper San Joaquin River

Clear. Lows 51 to 61. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

August Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 1 August, 2026

    46.4 °F

  • Average August

    73 °F

  • Highest 1 August, 2026

    91.4 °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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