Grinnell Lake Weather Forecast

    • 35
    • 54

    Slight Chance Thunderstorms

    • 36
    • 56

    Mostly Sunny

    • 34
    • 56

    Mostly Sunny

    • 31
    • 52

    Partly Sunny

    • 33
    • 53

    Partly Sunny

    • 34
    • 54

    Mostly Sunny

    • 36
    • 54

    Mostly Sunny

Today 29 Aug Upper San Joaquin River

Mostly sunny. Slight chance of rain early in the Morning, then slight chance of Thunderstorms in the late morning and afternoon. Highs 54 to 70. Southwest Winds 5 to 15 Mph with Gusts to around 35 Mph. Chance of precipitation 20 percent.

Tonight 29 Aug Upper San Joaquin River

Colder. Mostly clear. Lows 37 to 49. Southwest Winds up to 10 Mph. Gusts up to 30 Mph in the evening.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

August Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 14 August, 2026

    35.6 °F

  • Average August

    68.4 °F

  • Highest 1 August, 2026

    91.4 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
Get WillyWeather+ to remove ads