Grinnell Lake Weather Forecast

    • 43
    • 64

    Increasing Clouds

    • 42
    • 62

    Partly Sunny

    • 43
    • 63

    Mostly Sunny

    • 42
    • 63

    Mostly Sunny

    • 42
    • 62

    Partly Sunny

    • 43
    • 61

    Partly Sunny

Today 23 Aug Upper San Joaquin River

Sunny. Highs 63 to 79. South Winds up to 10 Mph shifting to the southwest in the afternoon. Gusts up to 30 Mph.

Tonight 23 Aug Upper San Joaquin River

Mostly cloudy in the evening then becoming partly cloudy. Lows 46 to 58. South Winds up to 10 Mph. Gusts up to 25 Mph in the evening.

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  • Temperature Real-Time

Grinnell Lake Temperature Statistics

August Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 14 August, 2026

    35.6 °F

  • Average August

    68.3 °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

    29.4 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
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