Britons will be sorry to say goodbye as the month goes out with a balmy bang before trademark showers usher in April's arrival.
Parts of the country will feel as warm as sunny Mediterranean hotspots on Thursday as temperatures soar to double the average for this time of year.
See also: Do you live in one of Britain's wettest cities?
See also: These are the top ten signs of spring in the UK
In the South East highs of 22C are forecast in the London area, while temperatures are expected to peak near 20C in Norwich and 18C in Bristol and Nottingham.
It's all due to warm air that has moved north from Iberia and calm conditions, although the weather will be cooler and cloudier further north.
Britons will be able to soak up the sun before showers move in
Met Office forecaster Alex Burkill said: "We are dragging up really warm air from Iberia and with relatively calm conditions in the South East that's what is allowing temperatures to climb quite high."
However a split across the country running from south-west Wales to Yorkshire means those north of the line will have a cooler, cloudier day with a risk of rain.
Belfast, Glasgow, Aberdeen and Edinburgh will peak at 14C, while the mercury will top out at 13C in Newcastle.
Temperatures will soar to 22C in the south
The warm air mass will edge south and eastwards on Friday, with heavy rain expected across Northern Ireland and western Scotland earlier in the day.
But temperatures are expected to remain well above average for southern parts before a wet start to the weekend.
Saturday will be cooler with sunshine and showers and a risk of frost overnight, Sunday will be dry with sunny spells, and Monday will be breezy with rain in the north and west.
It will be good to be near the sea in the south
Mr Burkill said: "Saturday is looking quite showery across the whole of the UK, although Sunday will be a pretty decent day for most with calm and bright conditions."
In the sunshine, highs of 16C and 17C could be seen in the south on Sunday - good news for the crowds expected to turn out for the Cancer Research UK Oxford and Cambridge Boat Races on the Thames.
Further north highs between 11C and 14C are more likely.
It's still to early to say what the weather will be like over the Easter weekend, but bookies have slashed the odds to 8-1 on it being the hottest ever.