Heatwave on the way - but guess where is set to miss out!
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Some areas may see highs of 19C (66.2F) on Monday afternoon with a possible peak of 24C (75.2F) on Wednesday, the Met Office said.
Forecasters said the best of the weather is expected on Wednesday, with sunny spells “persisting” and a high of 24C (75.2F) in London and the South of England.
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Hide AdBut by that stage temperatures in NI will be sitting around 11C although there is no rain forecast.
Met Office spokesman Oli Claydon said clouds will also “start to thin” and give way to clear skies and sunshine for much of the week.
Temperatures in March have not gone above 24C (75.2F) since March 29 1968, when 25.6C (78F) was recorded in Mepal in Cambridgeshire.
Mr Claydon said: “On Monday we could see highs of 19C (66.2F) in parts of eastern England, near Humberside and East Anglia, and warm quite widely.
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Hide Ad“Looking ahead to Tuesday, 23C (73.4F) is likely to be the maximum in parts of of south-eastern England.
“Wednesday is the headline figure for the week with our highest temperature of 24C (75.2F), and here we’re looking at London…”
But Mr Claydon warned that, by the Easter weekend, cold air from the north may bring a “notable” dip in temperatures, with showers forecast to spread to most areas.
In contrast to the sunshine in the south, in northern parts of the UK a yellow weather warning for heavy and persistent remains in place until 6pm on Tuesday.
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Hide AdThose living in areas of north-west Scotland saw more than 3.1in (80mm) of rain over the weekend, and residents in Seathwaite, Cumbria, received 7.4in (187mm), according to figures from the Environment Agency.
The coldest Easter weekend on record was in 2013 when minus 12.5C (9.5F) was recorded at Braemar in Aberdeenshire on Easter Sunday.