why aren't the matches playing at wimbledon?

are they not playing matches over 90 degrees?

They are expecting up to 104 degrees in London today - there are rules in place for Wimbledon if it surpasses 86,18 (30 degrees Celsius) - then the players can request additional breaks etc. if it will hit 104 - don’t expect any matches to be played 

Still scorching in London?

This week is perfect weather. I’m here in Northwest London visiting my family. 

Thank you for the update 

Normally their weather is pretty much like the one we have in Denmark (where I live) - and here they have forecasted “good weather” (and not warm until Saturday - then it should start raining more or less without end before Monday morning) - maybe the days can differ - but it is rarely one weather front hit one of the countries but not the other