By Eric Leister, AccuWeather meteorologist
June 17,2017, 2:30:06PM,EDT
A surge of very warm air will send temperatures to their highest readings so far this year across southern England into Monday.
Temperatures are expected to soar past 27 C (80 F) in parts of the East of England, Greater London, the South East and the Midlands into Monday.
More of South West England, away from the coast, will experience similar highs on Sunday and Monday, whilst temperatures will reach or exceed 30 C (86 F) in the warmest locations of southeastern England.
"London's Heathrow Airport recorded its earliest high of 30 C (86 F) since 2006 on Saturday," AccuWeather Senior Meteorologist Kristina Pydynowski said. "Last year, the airport did not reach this mark until 19 July."
The unseasonable heat will be accompanied by abundant sunshine and moderate humidity, creating even higher AccuWeather RealFeel® Temperatures. Allergy sufferers will also continue to face very high pollen levels.
RealFeel Temperatures will climb to 32-33 C (lower 90s F) in London on Sunday and Monday.
"Be sure to apply sun cream and grab sunglasses before heading to the festivities or other weekend plans," Pydynowski said.
Those looking to beat the heat can head to the beaches, where afternoon sea breezes blowing in from the cooler water will hold down temperatures.
"The sea breeze triggering thundery showers just inland from the beaches in southeastern England cannot be ruled out on Sunday afternoon," Pydynowski said.
In Wales and northern England, temperatures will also be well above normal Sunday and Monday.
Manchester will record highs of 25-26 C (77-78 F) all three days. Newport will join the other parts of southern England in recording a high of 27 C (80 F) on Monday.
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Dry weather will hold across Wales and northern England on Sunday with sunny spells expected each day.
While dry weather is expected across most of the United Kingdom, a few showers may dampen outdoor plans across Northern Ireland and Scotland.
Of the two days, Sunday appears to be the day with the most widespread rainfall. An odd shower will drop down to around Belfast, Glasgow and Edinburgh in the afternoon.
The weekend will otherwise be mild in these cities.
The passage of a cold front will trim temperatures back to more seasonable values in the northern U.K. on Monday.
"Whilst southern England will have to endure one more sizzling day on Monday, cooler air will gradually trim the summer heat on Tuesday into Wednesday, just in time for the start of Royal Ascot and Glastonbury Festival," Pydynowski said.
However, a change to more unsettled weather is expected by next weekend with possible impacts to these events.