They have had to wait for it this year – but sun lovers are finally enjoying sizzling temperatures.
Following a washout July and August, the September heatwave is expected to reach its zenith on Saturday, when temperatures could hit 33C in London, according to forecasters.
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The UK Health Security Agency has issued an amber warning for heat until 9pm on Sunday.
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This means weather impacts are likely to be felt across the health service, with those aged above 65 or with pre-existing respiratory or cardiovascular disease at greater risk.
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Although temperatures have risen this high before in September, it is unusual for the heat to last so long, with the Met Office predicting five to six days above 30C for some areas.
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The heatwave is being driven by tropical storms pushing a high pressure system over the UK, with the jet stream having moved to the north and bending into what is known as an omega blocking pattern.