The council is encouraging residents to think about how it may impact on their health and that of their friends and family.
The council works to the nationally operated Heatwave Plan that includes a Heat-Health Watch alert system which operates from 1 June to 15 September and is based on Met Office forecasts and data. This system triggers levels of response from the NHS, government and public health systems and communicate risks.
The Heat-Health Watch system comprises five main levels (0-4) ranging from year round planning for warm weather to the declaration of a major incident due to a prolonged heatwave being experienced.
The Heatwave Alert system is based on temperature thresholds where there is a 15-20% increased risk of a heatwave being declared. For York the trigger criteria for declaring a heatwave are 29/15/29C (Day/Night/Day).