Heat health alert issued for London

The yellow heat health alert is in effect from 9AM on 22/05/2026 until 5PM on 27/05/2026 across London. The yellow alert has a matrix score of 7. This means: Minor impacts are likely across health and social care services, including:

• increased use of healthcare services by vulnerable people
• greater risk to life of vulnerable people
• increased potential for indoor environments to become very warm
• water-related incidents may increase, including risks from cold-water shock and drowning

How to protect yourself if you are vulnerable

See our guide here