I sweat more then average over the trunk and groin area but that doesn't cause me too many problems in the uk type of heat. I don't really sweat much in the armpit area or hands and feet. Major problem with me is my face and head from where I sweat profusely in some circumstances.
Was working in London on Friday and by the time I went through the tube and had walked the 600 metres to work I was sweating massively, with sweat all over my face and coming down the sides of my face and neck, my hair starting to stick to my face, and I really hadn't been walking fast at all.
As normal, when I got to work, I headed to the toilets so that I could cool down by putting my wrists under cold water and just waiting there for 10 minutes or so. Normally does the trick and did so again. I was then fine all day throughout 2 meetings and working at my desk until my return journey via tube to Paddington station and back home to Swindon when the problem was repeated. It doesn't help that I wear a suit to work, but even without that I would be hot and clammy. I much prefer to work locally in Swindon where our offices have air con.
As I have said before, I don't know how those of you cope in truly hot conditions in the USA etc. I regard my problem as extreme in UK temperatures and could not contemplate working in a hotter environment.... This is the single biggest reason that has stopped me from applying for work in the US or Australia and relocate my family. I know that I have the aptitude to do so and better myself and my family, but I cannot imagine working in a hotter place than the UK.