Heat wave warnings are expected to remain in place as the forecast shows daytime highs hitting the mid 30s through Friday.
The tropical nights phenomenon will also continue.
On Thursday, heavy clouds will pass overhead, while inland regions get sporadic rain.
The mercury in the capital and Suwon could rise to 34 degrees Celsius, according to the national weather agency.
Health officials say people should avoid outdoor activities during periods of extreme heat and drink plenty of water to prevent heat-related illnesses.
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