Saturday
There will be outbreaks of rain across Scotland, Northern Ireland into parts of north west and south west England along with Wales throughout the day. This will become heavier across northern Scotland in the afternoon and rather breezy in the west as well. For the rest of Britain it's looking like a very warm to hot summer's day with lots of hazy sunshine. Highs to 10 to 31C.
Saturday Night
This evening eastern and central parts of England will be fine with sunny spells. Heavier rain is expected in the north and west and during the evening and overnight this moves into northern England with the south east dry. A warm, humid night with lows of 12 to 16C.
Sunday
This morning the rain in the north and west weakens as it moves in across central and eastern parts of England. Some sunshine develops in many areas and it stays hot in the south east. We see more persistent rain in the far south east in the evening spreading up into East Anglia and southern England in the night. Showers will affect western Scotland tonight and we may see some thundery rain into the far south east of England by morning with the rest of Britain dry with well broken cloud. Expect highs of 16 to 25C and feeling a bit fresher than Saturday.
Monday
Not as warm today because an area of heavy thundery rain in the south east is expected to spreads into much of England and Wales. For Scotland and Northern Ireland it's a day of sunshine and showers. That heavy rain then moves off into the North Sea this evening with most places then dry overnight but with a lot of low cloudiness. Expect highs of 15 to 20C.