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Warning Information


Very Hot Weather Warning

The Very Hot Weather Warning is now in force. Under the
influence of extremely hot weather, members of the public
should stay on the alert, drink more water, take all
necessary protective measures against the heat to prevent
discomforts caused by very hot weather, and pay due
attention to physical conditions. If symptoms such as
dizziness, headache, nausea, shortness of breath or
confusion develop, take rest and seek help immediately, and
seek medical advice as soon as possible.

Elderly persons, pregnant women, infants and children, those
with chronic illnesses, such as heart disease or high blood
pressure, as well as the obese are more vulnerable to heat
stroke. Watch out for any symptoms of heat stroke. Under
extremely hot weather, beware of health conditions, ensure
adequate rest, maintain normal body temperature, and avoid
overheating of the body.

When engaged in work under hot weather or high-temperature
environments, please refer to the Guidance Notes on
Prevention of Heat Stroke at Work of the Labour Department
and take necessary precautions.

When engaged in outdoor activities, drink more water and
avoid over exertion. If not feeling well, take a rest in the
shade or cooler place as soon as possible. Perform outdoor
activities in the morning or late afternoon as far as
possible. Under extremely hot weather, vigorous physical
activities should be avoided.

During indoor activities, replenish water timely. If there
is no air-conditioning, then windows should be kept open and
fans be used as far as possible to maintain adequate indoor
ventilation. Public facilities with heat sheltering may also
be used.

Avoid prolonged exposure under sunlight. Light-coloured and
air-permeable clothing, a wide-brimmed hat that covers the
back of your neck and ultraviolet (UV) blocking sunglasses
can reduce the chance of sunburn by solar UV radiation.

Choose a broad-spectrum water-resistant sunscreen product
with a sun protective factor (SPF) of 30 or higher when
doing outdoor activities and apply liberally; reapply every
two hours if you need to stay outdoors for a prolonged
period, or after swimming, sweating or towelling off.

Beware of health and wellbeing of elderly or persons with
chronic medical conditions. If you know of them, call or
visit them occasionally and check whether their household
ventilation and air-conditioning devices function properly.

Those more vulnerable to heat stroke should avoid outdoor
activities and stay away from hot environment as far as
possible. Stay in cool, well-ventilated or air-conditioned
places.

Dispatched by Hong Kong Observatory at 14:10 HKT on 27.07.2025


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