"We could get over 30C in some parts of the country," Erik Höjgård-Olsen, meteorologist at Swedish weather agency SMHI, told TT on Sunday.
After a sunny Midsummer weekend across much of Sweden, temperatures are set to drop slightly over the coming days. But the heat is expected to return in just a few days.
"A high-pressure system is coming from the south, reaching southern Sweden on Thursday and lasting at least until the end of the week," said Höjgård-Olsen.
The south-eastern parts of the country will bear the brunt of the heatwave, with temperatures of over 30C.
"In the rest of Götaland and Svealand, it will be just over 25C, while the coast and inland areas of Norrland will see temperatures of just above 20C," said Höjgård-Olsen.