In August the temperature is around 40º (104F), but by midnight it drops to about 30º (80F). This is when the locals start to go out and they stay out till 6am. It's worth staying up to sit in an outdoor cafe at 4am, particularly near the river, and definitely worth having a big siesta.
Updates
In late June we found that many outside bars were thinning out or even closing by 1:30 am, certainly on Triana river front.
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