From Tuesday, the majority of Svealand, north-eastern Götaland, and south-eastern Norrland can expect temperatures between 25 and 30 degrees.
Elderly people are particularly vulnerable to the heat, which requires preparations at care homes.
The area that can expect high summer temperatures stretches from Jönköping in the south to Örnsköldsvik in the north-east. How long the heat wave lasts is uncertain.
As it looks now, until Friday. Then we'll see, says Kristin Sahlström, meteorologist at SMHI.
When daytime temperatures are this high, it can put extra strain on the body, which can cause problems for risk groups. The elderly are particularly vulnerable.
In Stockholm, high temperatures are expected next week. It is essential to prepare in good time and not in the middle of the heat wave, according to Carl Smitterberg, communications manager at the Elderly Administration in Stockholm City.
One is quite familiar with the working methods and what needs to be done to get fluids to the elderly, and has cooler spaces if needed.
Fluids are particularly important in this context, as is the opportunity to cool down. It can also involve sitting outside in the shade where there is a breeze.
The heat wave next week is expected to last for a few days. The fact that it does not persist for a longer period is positive for elderly care, according to Smitterberg. In the event of a longer heat wave, other measures may be necessary.
It may involve having more supervision in home care and similar services, he says.
