Grinnell Lake Weather Forecast

    • 49
    • 69

    Slight Chance Thunderstorms

    • 47
    • 68

    Chance Rain Showers

    • 45
    • 66

    Partly Sunny

    • 45
    • 65

    Slight Chance Thunderstorms

    • 43
    • 62

    Slight Chance Thunderstorms

    • 40
    • 58

    Chance Rain Showers

Today 8 Aug Upper San Joaquin River

Mostly sunny. Highs 69 to 85. East Winds up to 5 Mph shifting to the southwest in the afternoon.

Tonight 8 Aug Upper San Joaquin River

Partly cloudy. Lows 52 to 64. North Winds up to 5 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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