Thousands headed for the sea today to escape the heat as thermometers hit the 90s - and experts say it's going to get even hotter.
Sizzling temperatures on Brighton beach eclipsed Barbados and forecasters predict tomorrow the city could bask in a record-breaking 100F (37.8C).
But the weather has caused headaches for commuters, who face delayed and cancelled trains because tracks are bending in the heat.
A blanket 60mph restriction was due to be placed across South Central's entire network from 1pm today, with delays of around 15 minutes on all services.
Roads could also be affected, with AA Roadwatch warning that tarmac could melt and engines overheat.
Thousands are flocking to Brighton beach but coastguards repeated their warning against leaping off groynes, saying crashing into shallow water could cause injury.
Peter Avey, who runs Seasiders amusement arcade and restaurant on the city's lower promenade, said: "It's hotter than ever. I think it may be too hot for a lot of people."
At Drusillas Zoo Park in Alfriston, special measures are being taken to ensure the animals remain cool.
Penguins have received cold showers from a hose while pigs are being given sunblock to protect their skin.
The emu has gone for a dip in a pool and lemurs were given their usual vegetables frozen in ice.
Weather forecaster Elizabeth Anett said: "It's going to be incredibly hot.
"Over the next two weeks we are going to see high pressure combining with southerly winds to leave most parts of the country basking in the good weather."
Jane Seddon, of the British Resorts Association, said the heatwave was a boost for the Brighton and Hove's tourist industry.
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