Grinnell Lake Weather Forecast

    • 48
    • 67

    Mostly Sunny

    • 47
    • 67

    Slight Chance Thunderstorms

    • 46
    • 66

    Mostly Sunny

    • 45
    • 66

    Mostly Sunny

    • 45
    • 66

    Mostly Sunny

    • 45
    • 67

    Mostly Sunny

    • 46
    • 68

    Mostly Sunny

Today 23 Jul Upper San Joaquin River

Warmer, sunny. Highs 67 to 81. South Winds up to 5 Mph shifting to the southwest 5 to 15 Mph in the afternoon. Gusts up to 30 Mph.

Tonight 23 Jul Upper San Joaquin River

Clear. Lows 50 to 60. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the southeast after midnight.

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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

    66.8 °F

  • Highest 10 July, 2026

    87.8 °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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