Approx 24C inside at the moment.
As much as possible I follow the pattern of open the windows overnight and then close them when the weather starts heating up, so today probably from 9AM - 9PM I will have the windows closed and the curtains/blinds drawn to stop the heat getting in as much as I can.
If I am lucky, opening them after 9PM cools the bedroom down a little before I go to sleep, but it can take 3-4 hours. If it's too warm outside or no breeze then it's a dead end and I put on the AC unit instead.