The couple will attend the launch of the National Emergencies Trust and the duke will then visit the London Air Ambulance charity gala.
The Duke and Duchess of Cambridge are meeting Grenfell Tower and terror attack victims as they visit personnel from across the emergency services.
William and Kate will begin their day at the launch of the National Emergencies Trust in central London.
The new independent charity will provide an emergency response to disasters in the UK, and has been set up after several terror attacks since 2017.
They will meet victims of disasters, including Grenfell and the Westminster Bridge attack, and make a short speech marking the official inauguration of the charity.
The duke was joined by his grandmother, the Queen, during a visit to the Grenfell site shortly after the blaze in June 2017.
In the evening, William will attend the London Air Ambulance charity gala in central London.
The duke worked as a pilot for the East Anglia Air Ambulance, and became a patron of the London organisation in January.
The charity is celebrating its 30th anniversary this year, and will hear a speech from William after he meets crew members, former patients and other supporters.