Grinnell Lake Weather Forecast

    • 35
    • 55

    Mostly Sunny

    • 38
    • 58

    Mostly Sunny

    • 39
    • 58

    Partly Sunny

    • 39
    • 60

    Partly Sunny

    • 40
    • 60

    Slight Chance Thunderstorms

    • 40
    • 60

    Slight Chance Thunderstorms

Today 14 Aug Upper San Joaquin River

Sunny. Highs 55 to 69. South Winds up to 10 Mph shifting to the southwest in the afternoon. Gusts up to 30 Mph.

Tonight 14 Aug Upper San Joaquin River

Mostly clear. Lows 38 to 50. South Winds up to 10 Mph. Gusts up to 25 Mph in the evening.

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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

    72.6 °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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