UK heatwave likely as amber and yellow heat-health alerts are issued

Temperatures are predicted to rise into the low 30ºC, according to the Met Office. The UK Health Security Agency issued amber and yellow heat-health alerts on 22 May 2026. The Met Office said it’s likely to be the first heatwave of 2026.

Several amber heat-health alerts were issued in 2025.  

What is an amber heat health alert?

An amber alert means weather impacts “are likely to be felt across the whole health service”. While there’s an increased risk to health for individuals aged over 65 years or those with pre-existing health conditions, an amber alert means there could be health impacts across the wider population.

Dr Anya Gopfert, consultant in health protection at UKHSA, said: “If you have friends, family or neighbours who are more vulnerable, it is important to check in on them and ensure they are aware of the forecasts and are following the necessary advice.” 

Will there be a heatwave?

A heatwave is declared in the UK when a location records at least three consecutive days with temperatures exceeding the threshold for that location. The threshold for most of the north and north-west of England is 25ºC, but for London and the Home Counties, it is 28ºC.

The Met Office predicts that heatwave thresholds could be reached across parts of the UK for the first time this year in May 2026.

How to prepare for periods of hot weather

It’s important to know how to prepare and stay safe during extended periods of hot weather.

William Spencer, climate and first aid product manager at the British Red Cross, said: “It’s important to take care while you have fun with friends and family and avoid getting sunburn, heat stroke or becoming dehydrated. 

“Higher temperatures can make it harder for the body to cool itself and we all need to take care to manage the health risks of heat. There are several steps you can take to keep yourself and others safe.  

“We would advise people to make sure they know how to recognise the symptoms of heat exhaustion and heat stroke and avoid activities in the middle of the day when temperatures are highest.  

“Other safety tips include wearing sunscreen, drinking plenty of water and drinking less alcohol. You can also help keep your home cool by keeping blinds and windows closed during the hottest parts of the day.”

Resources to help you stay safe:

• How to prepare for a heatwave
• Top tips to stay cool in hot weather
• How to keep your home cool in a heatwave
• How to keep cool at night
• How to prevent your home from overheating 

Hot weather will affect people in different ways and there are certain groups who are more at risk than others.

If you are a member of a vulnerable group or know someone who is likely to be more affected by a heatwave or hot weather, it’s important you are prepared for how to cope in a heatwave.