Widespread freezing temperatures overnight have brought one of the chilliest starts to the early May bank holiday.
It dropped to -1.7C in Sennybridge, Powys, overnight as icy Arctic air flowed southwards over the UK. Despite this, Wales could still be the warmest place in the UK today.
But we are not likely to see the high temperatures that everyone Wales enjoys hottest Easter Monday on record with temperatures higher than Barcelona
Met Office meteorologist Simon Partridge said: "We're stuck between high pressure to the west of us and low pressure to the east, which is giving us northerly winds - it's drawing air straight down from the Arctic."
Temperatures are expected to peak at 14C or 15C in the south on Monday afternoon, although northern parts will struggle to see double digits as a band of rain pushes towards the south and east.
In Wales, the Met Office said that after the chilly start it will "stay dry all day with some cloud but also plenty of long sunny spells, particularly in the late afternoon.
"It's going to be fairly chilly during the day, below average for the time of year, but it's not going to be too bad and the wind's going to be light," Mr Partridge said.
"It will be generally dry, although there is a band of showery rain that's going to slowly move its way from Scotland southwards through parts of Northern Ireland and northern England then eventually into parts of East Anglia.
"That will make it feel a bit cooler through there, but either side of it will generally be dry and bright with sunny spells.
"It will stay mostly dry in the south, where it will be warmest, so Wales and much of southern England will be fine."
Wales enjoys hottest Easter Monday on record with temperatures higher than Barcelona
The lowest recorded temperature for the early May Bank Holiday Monday was -5.9C on May 7, 2012, at Kinbrace in Sutherland. In Wales, it was -3.5C recorded at Talgarreg, in Ceredigion, in 1996.
But make the most of today because it is going to go downhill by Wednesday.
The Met Office forecast says: "Persistent and heavy rain will arrive on Tuesday night accompanied by brisk winds.
"These will be followed on Wednesday by heavy perhaps thundery showers probably continuing into Thursday and Friday."
Here is a more detailed forecast for different areas of Wales on Bank Holiday Monday
North Wales
Sunny intervals changing to cloudy by late morning. Highs of around 9C in places like Llandudno, and 10C in Bangor.
Mid Wales
Spells of sunshine in the morning, afternoon and evening, but it will be mainly cloudy with temperature highs of 11C in Machynlleth and Aberystwyth.
South West Wales
It will be a cloudy and overcast start to the day changing to sunny intervals by lunchtime. Highs of around 10C in Newport and 11C in Tenby.
South East Wales
Overcast for most the day at Barry Island with highs of 11C. There might be a bit of sunshine around 6pm.
