Saturday
Low pressure brings heavy spells of rain overnight into southeastern parts of England. This clearing to the east through the morning though further heavy rain will develop over the southeast and for eastern parts of Scotland. There could be some rumbles of thunder at times too. This will persist over northeastern Scotland through the remainder of the day. Brighter and breezier elsewhere with scattered showers. The best of the brightness over northwestern Scotland where it should stay dry too. Temperatures at 24 or 25C in southern England, 20 to 23C across central England. Elsewhere across the UK and Ireland highs of 17 to 19C are more typical.

Saturday Night
Saturday night is dry for most of us in the UK and Ireland. The clearest skies to the east with cloud build further to the west. Western parts of Ireland and Scotland could see a spot of light rain developing through the night. Overnight lows widely at 9 to 13C, milder for the southeast of England.
 

Sunday
A ridge of high pressure affects southern and eastern parts of the country on Sunday. This brings spells of sunshine, warm temperatures and dry weather for many across England and Wales. Thicker cloud and rain affecting Ireland and western Scotland, stronger winds here too. The rain is looking to be particularly heavy over much of Ireland through the afternoon. Highs at 15 to 21C for the island of Ireland, Scotland, Wales and northern England; 22 to 25 or 26C for central and southern England.

Monday
High pressure to the southeast of the UK on Monday with low pressure west of Ireland. Very warm with good spells of sunshine across southeastern and southern parts of England. Cloud thickening to the north and west giving hazy sunshine for much of central England then cloudier conditions for much of Ireland, Wales and Scotland. Outbreaks of rain for western and northern parts of Ireland and Scotland, some of them heavy. Highs widely at 20 to 26C across central and southern England, just 15 to 17C for the island of Ireland, Scotland, Wales and northern England.