The number of heat-related illness cases reported in late summer nearly tripled in the past 10 years, government data showed Saturday. An annual average of 215 heat-related patients were reported from "ipchu" to the end of August during the 2011-2015 period, according to an analysis by a research institute under the interior ministry using data from the Korea Disease Control and Prevention Agency. Ipchu, which falls on Aug. 7 this year, marks the beginning of autumn on the traditional calendar. The figure rose to an annual average of 658 cases in 2016-2020 and to 638 cases in 2021-2025. Deaths linked to heat-related illnesses also increased during the same period, rising from an annual average of 3.3 patients in 2012-2015 to more than four patients over the past decade from 2016 to 2025. In 2024 alone, 1,299 people suffered from heat-related illnesses and 12 died from ipchu to late-August. Heat waves are expected to continue until late August this year, with daytime highs expected to range from 31-35 C across the country.