Grinnell Lake Weather Forecast

    • 50
    • 70

    Partly Sunny

    • 48
    • 64

    Mostly Cloudy

    • 45
    • 59

    Chance Thunderstorms

    • 45
    • 59

    Chance Thunderstorms

    • 47
    • 64

    Chance Rain Showers

    • 47
    • 66

    Chance Thunderstorms

Today 11 Jul Upper San Joaquin River

Sunny until late afternoon then becoming partly sunny. Highs 69 to 83. South Winds up to 5 Mph increasing to southwest 10 to 15 Mph in the afternoon. Gusts up to 30 Mph.

Tonight 11 Jul Upper San Joaquin River

Mostly cloudy. Lows 52 to 62. South Winds up to 10 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

July Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 4 July, 2026

    39.2 °F

  • Average July

    65.2 °F

  • Highest 8 July, 2026

    86 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    60.6 °F
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