Largely dry and fine on Friday.
This Evening and Tonight:
Many places will be dry overnight with lengthy clear spells which will allow it to become cool compared with recent nights. However, there will also be a few showers, these are most likely across Devon and Cornwall. Minimum Temperature 10C.
A dry and bright start on Friday, but a few showers are possible in the west first thing. Cloud will thicken during the day, however it should remain dry. Maximum Temperature 21C.
Outlook for Saturday to Monday:
Mostly cloudy on Saturday with some drizzle over hills, but also a little brightness. Windier on Sunday, perhaps with some rain. Monday probably fairly cloudy. Often warm and humid throughout.
Day 6 to 15
On Tuesday northwestern areas will be cloudy and windy with outbreaks of rain, but with clearer conditions reaching the far northwest later. Elsewhere it will be drier with bright spells, and it will be warm and humid in the southeast. By Wednesday some rain may reach southern areas, but clearer weather should spread from the northwest by the end of the day. Through the rest of the week and weekend there will probably be a good deal of dry, bright or sunny weather, especially in the south, while the far west and northwest will have some thicker cloud and rain at times. This weather pattern is quite likely to continue through the rest of the period, with temperatures probably around normal, but perhaps rather cool in the north and northwest
Day 16 to 30
During this period it looks likely that the weather pattern will only change slowly. Areas of high pressure and associated settled weather are likely to dominate across the south and southeast, bringing generally dry and bright weather here. More changeable conditions with outbreaks of rain and strong winds are likely across the north and northwest, perhaps extending southeastwards at times. Into September, confidence in the forecast decreases. However, we will probably see longer dry and settled spells at times, these perhaps becoming more dominant than previously in the north and northwest. Temperatures by day are likely to be generally warmer than average, but there will an increasing chance of chillier nights.
Met Office : SW : 2018-08-16T16:11:28