Hong Kong's Centre for Health Protection (CHP), under the Department of Health, reminded the public on September 21, 2026, to take precautions against heat-related illnesses, including heat cramps, heat exhaustion and heat stroke, during very hot weather. It advised timely hydration, light-coloured loose clothing, well-ventilated indoor spaces, avoiding strenuous exercise and prolonged activities such as hiking, scheduling outdoor activity for morning or late afternoon, and avoiding caffeine and alcohol, which can speed water loss.

The CHP said infants and young children, the elderly, pregnant women, people with chronic illnesses such as heart disease or high blood pressure, overweight people and outdoor or manual workers are more susceptible. It advised keeping young children out of high temperatures and never leaving them unattended in a confined space such as a vehicle, and monitoring health indicators among other vulnerable groups. Outdoor and manual workers were advised to reschedule work to cooler hours where feasible and take breaks in shade.

The department said that over the past five years, Hong Kong has recorded more than 200 hospital admissions due to heat stroke each year, with two to five fatal cases occurring mainly during the summer months from May to September. Symptoms include dizziness, headache, nausea, shortness of breath or confusion, and severe cases can involve convulsions or loss of consciousness. The CHP also advised checking the Observatory's ultraviolet index and, when it is 6 or above, using sunscreen of at least SPF 30, seeking shade, wearing UV-blocking sunglasses, long sleeves and a wide-brimmed hat, and applying sunscreen before DEET-containing insect repellent.