There is a 60% risk of a heatwave for Monday and Tuesday with daytime highs in London reaching 32C and remaining warm at night.
NHS staff have been warned to prepare for a surge of elderly and ill patients suffering from the heat.
The Department of Health has also asked people to check up on vulnerable friends, relatives and neighbours.
The Met Office has predicted that around the country daytime temperatures could reach 29-30C, with minimum night-time temperatures of 15-18C.
London, the East of England, South West, South East and the Midlands are the most likely to be affected.
Officials had already said this summer may be warmer than the past couple of years.
In the meantime, our Cannas are growing slowly and looking forward to this sunshine boost, just have to make sure that they have plenty of water as well.
The weather predictions above also bring home a Canna message... just enjoying high daytime temperatures is not enough for Canna, and they need high night time temperatures to really thrive and produce the growth that only Cannas can do. We are looking forward to a week of intensive Canna growth, unfortunately the weeds will probably grow just as fast as well!