Hong Kong's Centre for Health Protection, part of the Department of Health, issued advice on August 23 urging the public to guard against heat cramps, heat exhaustion and heat stroke during very hot weather. It recommended timely hydration, light-coloured and breathable clothing, ventilated indoor spaces, avoiding strenuous exercise and prolonged activities such as hiking, and scheduling outdoor activity for morning or late afternoon. It also advised against caffeine and alcohol, which it said can speed water loss.

The notice 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 to heat stroke. It advised against leaving young children unattended in confined spaces such as vehicles, and said outdoor workers should reschedule work to cooler hours where feasible, use shade and take breaks.

According to the department, Hong Kong has recorded over 200 hospital admissions due to heat stroke each year over the past five years, with two to five fatal cases mainly between May and September. It listed dizziness, headache, nausea, shortness of breath and confusion as symptoms, and advised rest and prompt medical help if they develop. It also urged attention to the ultraviolet index, with sun protection advised at levels of 6 or above.