The yellow heat health alert is in effect from 9am on Friday 22 May 2026 until 5pm on Wednesday 27 May 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

You can see all the weather health alerts currently in place across England on the UKHSA data dashboard.

Schools and education settings can review the Schools and Education settings action card for more information on what actions to take.