High pressure is centred to the west of Ireland through Friday. A north-westerly flow affects all parts of the UK and Ireland. There will be sunny spells but also some showers, these continuing into the afternoon. Some of these showers may be thundery. More persistent rain may affect central, northern and eastern parts of Scotland as well as the north of England until late afternoon. Driest of the weather always in more western areas. Temperatures at 24C in southeast England, 16C in northern Scotland, more widely at 18 to 23C.
Showers and rain easing into Friday evening though some light rain or drizzle may persist over eastern parts of Scotland for a time. Cloudier skies to the north and west, clearer skies to the south and east. Overnight lows falling to 9 to 13C.
High pressure remains with us on Saturday. A northerly flow brings cool conditions and sunny spells. There is a risk of some showers in central and northern Scotland, with the risk of showers forming over the Pennines and parts of the Welsh Mountains on Saturday afternoon. These may merge in places in the northwest of England to give longer spells of rain. Dry for most and feeling cool. Highs at 16 to 22 or 23C.
High pressure looks set to dominate over the UK and Ireland on Sunday. This brings lots of dry weather with good spells of sunshine. There is a low risk of a shower forming over the Pennines and the Welsh mountains through the afternoon. Temperatures rising to between 19 and 23C but much cooler on eastern coasts at just 15 to 17C.