While it might be 100-110 in Fresno, it will be 90-95 up in Yosemite Be advised. Yosemite falls, what you most go there to see, is fed by a creek and can slow to a trickle or dry as early as July but usually lasts until sometime in august or September. Vernal and Nevada Falls are both year round fed by the Merced River. Bridal Veil Falls usually does not go dry but can in excessively dry years. The best combination of waterfalls and weather is in May and June. Obviously there is tons more there than just Yosemite falls. Half dome and El Capitan are awesome in their own right as is bridal veil falls. Obviously I've been there multiple times and love the place at all times of the year even when the falls are dry. But if you're out there on a once in a lifetime trip, you want to see Yosemite Falls actually be a water fall, not this.
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