Grinnell Lake Weather Forecast

    • 43
    • 62

    Chance Thunderstorms

    • 40
    • 57

    Rain Showers Likely

    • 36
    • 54

    Rain Showers Likely

    • 36
    • 55

    Slight Chance Thunderstorms

    • 37
    • 56

    Mostly Sunny

    • 38
    • 58

    Partly Sunny

Today 11 Aug Upper San Joaquin River

Mostly sunny. Chance of rain Showers in the afternoon. Highs 63 to 79. Southwest Winds up to 10 Mph. Gusts up to 25 Mph in the afternoon. Chance of Showers 50 percent.

Tonight 11 Aug Upper San Joaquin River

Partly cloudy. Lows 46 to 58. West Winds up to 10 Mph shifting to the northeast 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

    73.3 °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

    29.5 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
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