People across the South are being urged to check in on elderly and vulnerable neighbours as a yellow heat health alert comes into force at 6pm today (13/08/2025)
The warning, issued by the UK Health Security Agency (UKHSA) and the Met Office, will remain in place until 6:00 PM on 18th of August 2025.
The UKHSA says prolonged periods of warm weather can pose serious health risks, particularly for older people, young children, and those with existing health conditions. Even healthy individuals are being reminded to stay hydrated, avoid excess alcohol, and limit strenuous outdoor activity during the hottest parts of the day.
High pollen and UV levels are also expected, adding to potential health concerns. Hay fever sufferers are being advised to take precautions, while anyone spending time outdoors should apply sunscreen and wear protective clothing.
In coastal and inland towns and cities including Portsmouth, Chichester, Worthing, Littlehampton, Brighton, and Eastbourne, temperatures are forecast to peak at around 28°C. Overnight temperatures are expected to remain relatively mild, offering some respite from the heat.
The Weather Health Alerting System – operated jointly by the UKHSA and the Met Office – provides early warnings when extreme temperatures are likely to affect public health. The system helps local councils, emergency services, and health providers prepare for and respond to heat-related risks.
Public health advice during heat alerts includes:
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Staying out of the sun between 11:00 AM and 3:00 PM
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Keeping homes cool by closing curtains in rooms facing the sun
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Drinking plenty of fluids and avoiding excess alcohol
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Checking in regularly on elderly or unwell neighbours, friends, and relatives
The yellow alert is the first stage in the government’s heat warning system, with amber and red alerts reserved for more severe conditions. While this week’s temperatures are not expected to break records, the UKHSA says it is important to take precautions to prevent heat-related illnesses.
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