Just right for me today, about 15-16 C with a pleasant breeze; first shorts and T-shirt day of the year. I'm glad that I live high up near the edge of the moors; I find that it makes warm, sunny days much more pleasant - you don't get that stifling "concrete heat island" effect where the air seems to go stagnant, and it's very rare that there isn't at least a gentle breeze.
But I do get where jon85 is coming from, too. When it's a few C warmer than this, or when it gets humid, I flake out completely, especially when it's like that during the night as well as the day. I also struggle with the way that the world gets so much noisier when the weather is nice, and stays noisy later into the day as the evenings get lighter. I end up in a dilemma whether to open the windows to try to cool the room a little, or keep them shut to block out the noise.
And I now have the chimes of the local ice-cream van going relentlessly round and round in my head - I can't tell whether it's actually driving around a few streets away or if I'm just imagining it.
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When you are fighting an invisible monster, first throw a bucket of paint over it.