The temperature across much of Britain will peak around 23C over the next few days - but many will see the heavy rain continue, according to the Met Office.
Much of the UK is experiencing a late summer surge of fine weather after weeks of torrential downpours.
But heatwaves into the 30s as seen last month are unlikely and it remains unclear if the country has already seen its best weather of the year, said a spokesman for the national agency.
The Met Office's Stephen Dixon told the Mirror this afternoon: "There is still some unusual uncertainty going into the weekend and still plenty to play for for next week."
While temperatures are expected to reach around 26C before the end of the day, he said charts show Saturday's 23C in the southeast is probably the best the rest of the week has to offer.
"Signals for next week show some high pressure and warm spells but not significant heat in the forecast," continued Mr Dixon.
Asked how hot it could get as a result, he said it is too early to tell, as weather signals don't indicate specific temperatures.
"In the sunshine, with it being August it should be fairly warm," he said.
Mr Dixon added it's "probably too early to tell" if the best of the summer is already behind us.
"It’s British summertime and there’s variations in our weather," he added.
Tomorrow is likely to see some sunny spells across Northern Ireland and Scotland before showers move in from the west, moving across the northern areas into the early afternoon.
Mr Dixon said there'll be "widespread showers" in some northern parts but much of the country will remain "largely fine and dry" with "some good sunny spells" in the south.
Friday will be breezy with heavy showers in the north, particularly in the western coasts of Scotland, with the east set to be fairly dry.
And while it will be mostly clear and warm in much of England and Wales on the final weekday, there is likely to be "some varying amounts of cloud", said the spokesman.
Meanwhile, drizzle is expected in the south west as a "weak front meanders its way" across the region, with rain most likely on the coast and in the hills.
Eastern England could also see some "extensive" rain later on Friday, but forecasts remain unclear.
"Moving into the weekend, there’s continuing uncertainty in the forecast at the moment, it all depends on how the weather patterns over the next couple of days," said Mr Dixon.
"We should have some more clarity tomorrow," he added.
Current indications suggest breezy conditions with sunny spells in the north, while showers could persist in the north west.
More cloud is also likely on Saturday in the south, as well as some light rain in some coastal areas.
"Temperatures will be around average but if you’re in the sun it will be quite pleasant for most in some southern areas," said Mr Dixon.
But he reiterated there is "low confidence in how it's going to play out", particularly where the rain may strike in the north on Sunday, when a band of rain is also set to hit in the south.
"Although showers are possible next week, the widespread downpours are more unlikely," said Mr Dixon.
It comes as long-range forecasts from Netweather predict temperatures of more than 25C could descend on the nation later in the month.
Some areas of the south west could see soaring temperatures as high as 27C on Sunday August 22, the forecaster claims.
