A high pressure pulls in from the south, which means sun and bathing-friendly temperatures.
During Thursday, the thermometer may climb up towards the 30-degree mark in some places.
Further north, however, it gets significantly cooler.
Large parts of Norrland can count on cloudy weather and occasional rain is expected in the mountains.
Hear SVT's meteorologist Nils Holmqvist give this week's forecast - and a prediction of how long the heat will last.