Temperatures are set to be five to six degrees above average for the time of year, with highs of 21°C in Wales this weekend.
After a washout week with torrential rain causing flooding in parts of Wales, ex-Hurricane Sam, spinning near Iceland, is sucking warm subtropical air north meaning it will be "unusually" warm.
There is still rain in the forecast as the former hurricane is bringing humidity with it, but next week high pressure remains in charge over the south west of the UK meaning drier and more settled weather for Wales, even though temperatures will take a dip.
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In some places in Wales temperatures have risen seven degrees from Wednesday to Thursday.
Welsh forecaster Derek Brockway says: "What a difference a warm front makes! Yesterday morning 11°C in Llanfairfechan. Now 18°C with tropical maritime air. The dew point has risen too so feeling more humid today."
Met Office forecaster Aidan McGivern says: "It has been an unsettled October so far for many places. Ex-Hurricane Sam has been swept up by the jet stream, and its energy has pushed it to the north of the UK, which allowed high pressure to build in from the south.
"But the ex-hurricane also contains a lot of sub-tropical humidity and that humid air and moisture is going to be pushed towards the UK. That means it is going to be unusually warm for the time of year, but there will be a lot of wet weather in the north west of the UK, in Scotland."
Presenting the weekly 10-day look ahead forecast he added that there will be "some sunshine" on Friday with highs of 21°C, with "very mild nights" that will see temperatures remaining in the mid teens.
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Sunday looks to be the best day of the weekend in Wales, as there will be a lot of cloud cover in the UK on Saturday afternoon, with temperatures around 18°C.
He added: "By Sunday any showers are clearing south, and there will only be a few dribs and drabs of rain with brighter skies following for much of the UK.
"It will be a dull start, but brightening up through the day. Slightly colder air pushing south but it is going to take a couple of days as warm for the time of year on Sunday afternoon."
Looking ahead to next week, he said: "The high pressure is anchored to the south west of the country. Middle of next week the high will be centred to the south west of the UK, with the jet stream coming in around the top of the UK.
"The main emphasis for next week is that high pressure is going to build, it is going to turn things much more settled and much drier compared to this week. It will also turn colder and with any clear skies at night will see some frost and fog patches in rural areas."
Temperatures will dip to slightly below average next week, with around 12°C to 14°C by day.
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