Low pressure has ruled for much of the past week, but this weekend sees a a ridge of high pressure build in from the southwest, bringing a well-timed respite of fine and dry conditions for most. But, the ridge is transitory, which means Atlantic weather systems will push back in from the west to end the weekend, so Saturday will probably be the better day of the weekend for western parts, as we see that change from the west during Sunday.
Saturday starts on a chilly note, with temperatures falling close to freezing at dawn in the Highland glens of Scotland and as low as 3-5C in some sheltered spots further south across England and Wales. There is also some mist anf fog patches around and some low cloud across SE England and East Anglia - but the mist, fog and low cloud should lift and break up, with most areas ending up with a fine and dry day with prolonged sunny spells in many areas.
Feeling pleasantly warm in the sunshine in the light winds. Temperatures reaching 19C in London, 18C in Cardiff, Manchester and Newcastle, 17C in Belfast and 16C in Glasgow.
Staying dry with clear spells overnight and so turning chilly again, with temperatures falling into low single figures across northern and western areas, perhaps close to freezing again across sheltered glens in Scotland. Mist or fog patches forming again in places and cloud thickening across Ireland and Northern Ireland by the end of the night.
Another fine, dry and sunny day on Sunday for central and eastern areas once early mist and fog clears. A cloudier day for Ireland and Northern Ireland, with rain spreading in from the west through the day. And after a bright or sunny morning, cloud thickening across Scotland, NW England, Wales and SW England during the afternoon, with rain arriving across western Scotland and the western fringes of Wales by early evening. Temperature perhaps reaching 20C in London, 18C in Norwich, 16C in Cardiff, Manchester and Belfast, 15C in Edinburgh.
An unsettled start to next week
Turning unsettled across all parts to start the new week, as one frontal system bringing rain across northern and western parts Sunday night spreads rain slowly eastwards through Monday, followed by another frontal system from the west bringing showery rain across many parts for Tuesday. A drier and brighter day looks likely on Wednesday once early showers clear eastern England, though cloud and rain looks to spread across northern and western Scotland through the day. Some uncertainty for later in the week, but it looks like low pressure will be close to the north, with a band of rain clearing east on Thursday to brighter and showery conditions. Maybe drier and brighter conditions for most on Friday, though risk of showers in the northwest.