Cold and Very Hot Weather Warnings
Hong Kong experiences both hot and cold seasons. The Observatory maintains a close watch on the local temperature changes. It issues warnings whenever Hong Kong is threatened by cold or very hot weather, to alert members of the public to the danger of low body temperature in cold weather or the risk of heat stroke and sunburn in very hot weather.
Once issued, the warnings are broadcast over radio and television. If necessary, the Observatory will hold press briefings, through which members of the public are reminded to take necessary precautions.
If cold or very hot weather persists while the corresponding weather warning is in force, the Observatory will repeat the special announcements to remind the public to take necessary actions.
These warnings also alert relevant government departments, such as the Home Affairs Department to consider the need to take actions, such as the opening of temporary shelters.
It is important that members of the public take note of these warnings and take steps to protect themselves and their family against cold or very hot weather. For an update on the status of weather warnings, the public may listen to radio and television broadcasts, call the Observatory's Dial-a-Weather service at 1878200, browse the Observatory's website (https://www.hko.gov.hk) or use the mobile app "MyObservatory".
Members of the public should pay attention to safety when using electrical appliances during cold and very hot weather. For details, please visit the Electricity Information Corner of Electrical & Mechanical Services Department.
Actions to be taken for Cold Weather Warning
- People are advised to put on warm clothes and to avoid adverse health effects due to the cold weather. You must also ensure adequate indoor ventilation.
- If you must go out, please avoid prolonged exposure to wintry winds.
- If you know of elderly persons or persons with chronic medical conditions staying alone, please call or visit them occasionally to check if they need any assistance.
- Make sure heaters are safe before use, and place them away from any combustibles. Do not light fires indoors as a means to keep warm.
- Please ensure that there is plenty of fresh air in your room when you are using an old-type gas water heater.
Actions to be taken for Very Hot Weather Warning
- When engaged in outdoor work or activities, drink plenty of water and avoid over exertion. If not feeling well, take a rest in the shade or cooler place as soon as possible.
- People staying indoors without air-conditioning should keep windows open as far as possible to ensure that there is adequate ventilation.
- Avoid prolonged exposure under sunlight. Loose clothing, suitable hats and UV-blocking sunglasses can reduce the chance of sunburn by solar ultraviolet radiation.
- Swimmers and those taking part in outdoor activities should use a sunscreen lotion of SPF 15 or above, and should re-apply it frequently.
- Beware of health and wellbeing of elderly persons or persons with chronic medical conditions staying alone. If you know of them, call or visit them occasionally to check if they need any assistance.
Hot Weather Special Advisory
Under such situations as high temperature, high humidity and light winds while the weather conditions remain below the level for issuing Very Hot Weather Warning, people may still be exposed to the risk of heat stroke if they do not take appropriate precautions. The Observatory will issue the "Hot Weather Special Advisory" through various channels when such weather conditions are expected. The advisory serves to remind the public as early as possible to avoid being affected by hot weather, especially for those engaging in outdoor work or activities. They should pay attention to their health conditions, drink enough water and take appropriate protective measures against the heat.