Temperatures are predicted to soar this week as September temperatures reach those last experienced in July.
A yellow heat alert has been issued by the Met Office as temperatures are predicted to reach upwards of 30C during a period of high pressure in the eastern region.
Official heatwave criteria could be met as early as Tuesday, with temperatures expected to reach 30C.
A heatwave is declared when a location records a period of at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold.
Wednesday and Thursday are due to reach peaks of around 28C or 29C in Suffolk and will be the hottest days.
The yellow heat alert is due to start from 2pm on Monday, and will be in place until 9pm on Sunday.
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Temperatures will remain uncomfortably warm overnight, especially in the south, with a chance of tropical nights, which is when overnight temperatures remain in excess of 20°C.
A spokesman for the Met Office said that there will be mist and fog in the early mornings, but that this will clear quickly as the day starts to heat up.
Temperatures are set to cool over the weekend, coming back down to the September average of about 20C by next week.
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