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The heat index reflects how hot it actually feels by combining air temperature and humidity, making it a more accurate measure of health risk than temperature alone. At levels above 52°C, even short exposure can be dangerous. Authorities have warned that symptoms such as fatigue, dizziness, rashes, swelling, cramps, and in severe cases, heatstroke, may occur and require immediate medical attention.
Special precautions have been urged for vulnerable groups, including young children under five, the elderly over 60, pregnant women, individuals with underlying health conditions or obesity, those who consume alcohol, outdoor workers, exercisers, and tourists. However, officials stressed that the risks extend to everyone, not just those outdoors.
Bangkok’s heat warning system has four levels: “caution” (27–32.9°C), “warning” (33–41.9°C), “danger” (42–51.9°C), and “extreme danger” (52°C and above). Each level comes with escalating safety advice, culminating in a complete avoidance of outdoor exposure at the highest level.
To help residents cope, authorities recommend seeking air-conditioned “Heat Escape Rooms” listed on the Greener Bangkok website and monitoring conditions via the AIR BKK mobile app. In emergencies, particularly if someone collapses due to heat, the public is urged to call the 1669 hotline immediately.
