I was planning a trip for next July, but my daughter has said she thinks it will be too hot. Anyone been in the summer and is it miserable or doable? If it’s 100 degrees, I doubt anyone will feel like hiking!
We went this past July. We stayed in Yosemite Valley Lodge. We knew it was not airconditioned. It was in the mid 90s in the daytime and in the low 60s overnight. I thought the rooms would cool off in the evenings. Nope, the building was apparently designed to trap heat in, and the room felt like an oven until the very early morning - 4am or so. And this was with leaving our balcony door fully open all night for extra ventilation, and leaving the room door open while we were awake to get some cross flow through the room. The first night I hopped in the shower 3x to cool off. There was screaming (party screaming) at the campground across the street well past the 10pm quiet hours. I called the desk at 11:30pm, and they called the NPS to deal with it, which took some time. I think past midnight it finally calmed down.
The crowds were brutal, the heat was intense. We wanted to do Vernal Falls, but I knew it was quite a climb and very exposed to the sun. And then the packed shuttle ended up not running out to the trailhead shuttle stop for unspecified reasons. The last stop was Curry Village, where everyone got off, and then we learned it would be 30 minutes walk from there just to get to the trailhead, in the blazing heat. We ended up hiking to Mirror Lake - which also required 30 minutes to the trailhead, but the hike itself was a little more shaded and less elevation. But I still drained my entire 2L camelback and would have drank more if I'd had it. The shuttles were packed and more infrequent than I would have thought. Some shuttles had to pass by because they were too full to pick up more.
We unfortunately did not get to Glacier point, as the July crowdstrike IT-airplane issue had messed up our trip plan. That being higher elevation should have been much cooler. We also didn't get to do the hiking we wanted on the Tioga Road area - which also would have been higher elevation - due to the delay. We did enjoy the 15 minute walk to Yosemite Falls from our lodging, bridal veil falls early in the morning the day we left, the pool at Yosemite Valley Lodge was great - nice and cold, and both evening meals we had near our lodging were great (we originally had Ahwahnee dinner reservations one night, but again ... crowdstrike interfered). I wanted to change into swimsuits and wade in the Merced River, but after our hiking and the crowds, none of us felt like walking to a shuttle stop and waiting in the sun for 20-30 minutes to be able to do that.
If I were going to be at Yosemite again in July, I think I would avoid Yosemite Valley altogether, stay south of the park, and focus on Glacier Point and then Tioga Road.