Mosly it cools down to a point where it's okay to pull on some long trousers and stroll out into the breeze.
Last night though, there was no breeze.
I sat in Casa Bohemia bar and sweated. I got in later and cold showered before sleep.
The first point to realise is, pun intended, the weather here is a breeze compared to Hanoi. Most nights the
wind wafts off that huge lake and it's both cool and deliciously fresh.
In Hanoi every expat had air conditioning, as did every office. At the very least, during the summer months, you'd have an industrial sized fan just inches from your face drying you and pelting you with dust, cigarette smoke and bugs.
I wondered what they did before the fans and the air con. How did they survive? Living with that heat seemed impossible.
Well we have fans here, albeit normally the slowly turning ceiling variety but there's very little air con - so I am starting to find out. This is, they tell me, the very hottest part of the year before the rainy season sets in.
Air con was a must for me in Hanoi - I couldn't have functioned with out it. The last breeze there was probably not in living memory.
Here, you can manage with just a fan.
You just get very very hot.
* Weather graphic from here. I hope they're right about that storm.