"Authorities in 11 countries warn residents and tourists to take
precautions amid region’s most intense heatwave – nicknamed Lucifer –
since 2003.....
As temperatures in many places hit or exceeded 40C (104F) in the
region’s most sustained heatwave since 2003, emergency services are
being put on standby and people have been asked to “remain vigilant”,
stay indoors, avoid long journeys, drink enough fluids and listen for
emergency advice from health officials."
http://abcnews.go.com/International/wireStory/lucifer-heat-wave-parts-europe-red-alert-49051297
It's been horrendous in Rome and will be next week. 99º Sunday, 99º Monday, 98º Tuesday, 98º Wednesday, 95º Thursday.
https://www.theguardian.com/world/2017/jul/24/rome-water-rationing-italy-heatwave
Even in places like Split, Croatia, it will be in the upper 90s for the next 6 days.
If I were to go to Europe, I'd focus on the Scandinavian countries, Scotland, and Ireland for starters.
Please be careful to those of you who are traveling to Europe in the heat of the summer.