A hot day for us is in the 90's to the low 100's. I think the hottest ever recorded in Denver area is 105. Nowadays we see about 40 days/year above 90, but the nights are cool (50's and 60's in summer), and we usually park the Leaf+ outside overnight.
We have never DCFC, nor even charged away from home - this car is an urban corridor runabout for us. Minimal highway miles, mostly commuting and errands, visiting friends and family, etc. (We have other vehicles to cover our other transportation needs. None get driven very far, so I'm less concerned with our carbon footprint.)
We typically keep the Leaf+ between 20-80% SoC. Have only rarely charged to 100, and then not on a hot day, that's more a winter thing. I have never seen the battery temp read above the middle of the scale, although in the dead of winter, I've seen it in the bottom third.
Given our use case and driving/charging habits, this should be a low risk vehicle purchase. We were able to take advantage of the generous Colorado incentives in 2019, receiving ~40% off of purchase price, which helps. We did buy dedicated 17" wheels and snow tires, as we run snows on all of our year-round cars, and I wanted to explore the range hit driving with my preferred set up. It's quite reasonable, turns out.
I haven't invested in Leaf Spy or a dongle. I know that would give more data, but I'm satisfied watching folks here report on their experience for now.