A warning for high temperatures is in place for the Kalmar region from Monday afternoon until Wednesday evening.
There is also a heat warning for Götaland and Värmland which will apply from 2pm on Thursday until Sunday evening.
SMHI issues high-temperature warnings when daytime temperatures are expected to stay above 26C for three consecutive days.
"On Saturday, temperatures could climb above 30C, reaching up to 33C in some places," SMHI meteorologist Catarina Wahlström told the TT newswire.
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The warning is primarily aimed at vulnerable risk groups, including the elderly, young children, pregnant women, and people with underlying health conditions.
"You should pay close attention to your body's signals, stay in the shade or indoors, and drink plenty of water," Wahlström added.
Scientists have shown that recurring heatwaves are a clear marker of global warming, primarily caused by burning coal, oil and gas – and warn they are set to become more frequent, longer and more intense.
According to a report from SMHI, the average temperature in Sweden was 1.9C (3.4F) higher in the period between 1991 to 2020 compared to the period between 1861 and 1890.