Couldn't run on Thursday or Friday, so snuck in a run on Saturday morning about 11am. This may not have been a good idea.
Problem 1: It was raining from pre-awn first thing so I though I wanted to go out about 7am (just after dawn), I ended up waiting several hours for the rain to pause before going out.
Problem 2: When I did go out, the clouds had completely cleared, so though the air temperature still showed as 29 degrees, in direct sunlight it felt baking.
Problem 3: Pools of water on the sidewalk plus lots of direct sunlight equals terrifying humidity
Problem 4: The park was empty - because nobody sensible does intense exercise in these sort of conditions. So I although I thought I was running slowly and steadily, I ran too fast.
So, after the usual first five minute discomfort passed, and the next ten started off feeling "that's okay, things are working now", they rapid slumped into "I feel I'm going to die."
So 19 minutes into the 28 minute run I gave up, feeling nauseous and horribly overheated. First time I've given up on a run, and felt rotten about it. Crawled home, felt better after lots of water and a couple of cool showers. Lots of lessons learnt, including "You can't sneak past Shenzhen sunlight" and "Find a way to reliably judge your pace, please."
I'm back in the UK now (Shenzhen->Shanghai->Paris->Manchester), and will repeat this run bright and early Monday morning. Wish me better luck!