Grinnell Lake Weather Forecast

    • 37
    • 60

    Mostly Sunny

    • 40
    • 62

    Mostly Sunny

    • 42
    • 65

    Mostly Sunny

    • 43
    • 66

    Mostly Sunny

    • 43
    • 65

    Slight Chance Thunderstorms

    • 41
    • 64

    Slight Chance Thunderstorms

Today 20 Jun Upper San Joaquin River

Sunny. Highs 58 to 72. Southwest Winds up to 5 Mph with Gusts to around 20 Mph increasing to 5 to 15 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 20 Jun Upper San Joaquin River

Mostly clear. Lows 39 to 49. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the northeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

June Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 8 June, 2026

    33.8 °F

  • Average June

    65.3 °F

  • Highest 16 June, 2026

    86 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.6 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.7 °F
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