Grinnell Lake Weather Forecast

    • 47
    • 62

    Rain Showers Likely

    • 45
    • 59

    Rain Showers

    • 46
    • 62

    Chance Thunderstorms

    • 47
    • 66

    Mostly Sunny

    • 48
    • 66

    Slight Chance Thunderstorms

    • 47
    • 66

    Slight Chance Thunderstorms

    • 48
    • 67

    Mostly Sunny

Today 20 Jul Upper San Joaquin River

Mostly sunny until late afternoon then becoming mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the late morning and afternoon. Highs 61 to 77. Southwest Winds up to 10 Mph. Chance of precipitation 50 percent.

Tonight 20 Jul Upper San Joaquin River

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then chance of rain after midnight. Lows 50 to 60. Northwest Winds up to 10 Mph shifting to the northeast after midnight. Chance of precipitation 50 percent.

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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

    66.7 °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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