In the UK, temperatures of 30 and higher just felt **very** hot. Sticky, itchy, horrible. I imagine it would be very similar in Sweden.
A lot of places are poorly ventilated and, of course, air con is almost non-existent. Even in places like shopping malls.
The first job I had in the UK, the temperature inside the office would be 27 C even when it was just over 20 C outside.