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Here in MA, I used my spa Sunday night. Air Temp was in the 80's. I had a sore shoulder and the tub felt great. It's been in the high 90s, maybe even over 100 the past few days. I have no desire to go in the hot tub in this weather. My above ground pool was at 92 yesterday. I can only imagine what the hot tub was at.
When it was Hell in L.A. (last week), I was in the tub. I've turned it all the way down, and it dropped to 90. Felt good.Now, it's at 82!! The problem with those temps (at least the 90 temp, haven't been in since it dropped lower) is that you can go in, and then never leave. It's a big problem.