Forecasters predict that certain regions of the UK will be warmer than Ibiza and Crete this week, with temperatures exceeding 20 degrees Celsius (68F).
Thursday will be the hottest day of the week before temperature decreases again for the weekend.
Temperatures are not likely to exceed the 23.4C (74.12F) recorded last month in St James's Park in London.
Hotter temperatures in the UK
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The greatest of the summer heat is expected to strike London and the south-east, with temperatures reaching 20 degrees Celsius in the city.
Forecasters predict mild weather in the second part of May, with hot periods much more likely in June.
It's all because to a "Spanish sizzler" blowing in across the mainland during the Jubilee week, which runs from June 2 to 5, when Her Majesty celebrates her 70th year on the throne.
According to Met Office forecaster Simon Partridge, "this week is a strange old one; there's a lot of rain and cloud quite as well as bright periods, with many locations progressively heating up until Thursday, which seems to be the hottest day," as per Sky News.
The climate in Wales, central and southern England, and eastern Scotland will be in the upper teens and low 20s between Monday and Wednesday, with eastern Scotland reaching 19 degrees Celsius (66.2F).
However, there will be overcast and scattered showers in regions of Northern Ireland, Northern England, and Scotland.
Thursday will see high teens across the nation, with parts of the South East reaching 21C (69.8F) and an outside possibility of 22C (71.6F) in locations with more sunlight.
So, a warm period is on the way for many, but don't anticipate the wall-to-wall sunlight and blue sky that we experienced in April.
According to the Met Office, there is high pressure to the south of the UK and low pressure to the north.
Forecasters expect that many places will get colder beginning Friday and continuing through the weekend.
Despite this, temperatures in the south should continue in the high teens.
Weather-wise, today's bank holiday Monday will be a mixed bag, with gloomy skies for some and sunshine intervals and higher temperatures than Sunday in other areas of the country.
Showers are expected to develop across northern England and southern Scotland.
Those rains will be mostly gone by nightfall, however southern Scotland and northern and eastern England will struggle to remain dry for long.
Things will begin to heat up on Tuesday, with warm, sunny intervals in the southwest.
Wednesday will see some severe rain and thunder in the early afternoon, but things will clear up fast as the weather becomes "quite warm" across much of the country, according to the Met Office.
Weather forecast within the week
Tuesday night:
Most showers are dissipating, although some remain across southern Scotland, and northern and eastern England.
The sky is mostly overcast, but there are a few clear moments. The northeast is cold, and there are occasional fog patches in the southwest.
Tuesday:
Mostly overcast, with scattered rain and showers. Cool in the east, but mild in sunny periods in the southwest.
From Wednesday through Friday, the forecast is as follows:
Weds, showery rain moves east, with heavy/thundery showers possible in the east for a while early afternoon. The rest of the day will be cloudy with a chance of rain/showers. Many people are becoming pretty warm.
