Britain is set to enjoy a sunny weekend, with temperatures reaching 24C, after a pleasant week.
The Met Office says the mercury will be 7C above average on Saturday, making September one of the warmest on record.
The weekend is expected to be "largely dry, bright and fine", according to forecasters.
On Saturday, most parts of the country are expected to stay dry and sunny.
Scattered showers are expected over southwest England, but other than that it will be a fine day.
On Sunday, most of the country will also experience sunny weather - but some scattered showers might occur in the far South at the beginning of the day.
The warm weather is down to a high pressure front moving across the UK, forecasters say.
Met Office forecaster Aidan McGivern said: "It will be a mostly fine weekend, with just some showers in the South later on Saturday and petering out on Sunday, with high pressure holding on."
Brian Gaze, The Weather Outlook forecaster, said: "Warm air will move into Britain from the region around Holland, with warm conditions and highs into the mid-20s.”
The Met Office issued flood warnings across the UK, particularly in Wales and parts of England.
Liverpool is forecast to see highs of 19C on both Saturday and Sunday and stay bright and dry.
Other parts of the North East, such as Newcastle, are also expecting similar weather conditions although the temperature will be cooler, sitting at around 15C.
Ollie Claydon, a spokesperson for the Met Office, said that the warm weekend temperatures would come ahead of a more "unsettled" week of weather.
"We're in for a dry and fine evening on Saturday, with clear conditions for central parts of the UK and northern Ireland," he said.
"There's a risk of showers but temperatures will stay high.
"But then a cold front from the north west around lunchtime on Monday will herald the arrival of cooler, more unsettled weather next week."
The Metropolitan Police urged Londoners to "continue to act responsibly" amid forecasts of warm weather for the capital over the weekend.
The force said it will continue to patrol public spaces and respond to incidents where groups of more than six are gathering, reminding the public of fines for breaching coronavirus guidelines.
Any social gathering of more than six people in England is against the law, with people facing fines of up to £3,200 if they do not adhere to the new measure, which applies to both indoor and outdoor settings.
UK 5 day weather forecast
Most areas fine and dry with plenty of sunshine today. Cloudier at times over parts of the far north and east of Scotland and northeast England. Also a chance of scattered showers over southwest England. Breezy over England and Wales.
Most areas dry with clear periods. Cloudier across the far north and east. Scattered showers possible in the far south. Fog patches likely in parts of Scotland and Northern Ireland.
Most areas fine with plenty of warm sunshine once early areas of cloud clear. Generally dry too, though chance of scattered showers in the far south at first. Less breezy.
Outlook for Monday to Wednesday:
Fine with warm, sunny spells for many on Monday. Turning cooler and unsettled from the northwest during Tuesday and Wednesday with showers or longer spells of rain and stronger winds.