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.
Grinnell Lake Temperature Statistics
July Temperature
Mammoth Yosemite Airport (10.6 miles)
Lowest 1 July, 2026
41 °FAverage July
61.6 °FHighest 3 July, 2026
80.6 °F
Climate (2021–2026)
Mammoth Yosemite Airport (10.6 miles)
Average Low 2021–2026
29.5 °FAverage 2021–2026
45.8 °FAverage High 2021–2026
60.6 °F