Grinnell Lake Weather Forecast

    • 41
    • 58

    Slight Chance Thunderstorms

    • 42
    • 62

    Mostly Sunny

    • 43
    • 64

    Mostly Sunny

    • 45
    • 68

    Mostly Sunny

    • 46
    • 69

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

Today 5 Jul Upper San Joaquin River

Partly sunny until late afternoon then clearing. A 20 percent chance of Thunderstorms late in the afternoon. Highs 58 to 72. Southwest Winds up to 10 Mph. Gusts up to 25 Mph in the afternoon.

Tonight 5 Jul Upper San Joaquin River

Mostly clear. Lows 43 to 53. Southwest Winds up to 10 Mph shifting to the east after midnight.

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Grinnell Lake Temperature Statistics

July Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 1 July, 2026

    41 °F
  • Average July

    61.6 °F
  • Highest 3 July, 2026

    80.6 °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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