There is a reported risk of extreme heat in certain cities due to El Niño, with Ho Chi Minh City and Bangkok being mentioned as particularly vulnerable. El Niño is expected to bring severe heatwaves, drought, and other weather-related issues, with some reports indicating a potential surge in ocean heat and powerful storms. The severity and impact of El Niño on the region, including the specific timing and temperatures, is not uniformly specified across the reports.