Often cloudy overnight, with some drizzle in the west.
This Evening and Tonight:
Although there'll be some clear spells in the east at first, it will be a rather cloudy night, with mist thickening over the moors and with some patchy drizzle at times. Mild for all, with temperatures holding in double figures. Minimum Temperature 13C.
A cloudy and damp start, but some bright or sunny breaks will develop during the afternoon. A few light showers are also possible. Staying humid and feeling warm once again. Maximum Temperature 25C.
Outlook for Tuesday to Thursday:
Humid and often rather cloudy on Tuesday and Wednesday. However, feeling warm in any spells of sunshine. A band of rain clears southwards on Thursday morning, with fresher weather following.
Day 6 to 15
On Friday and Saturday many places will have sunshine and showers. These showers heavy at times and with a risk of hail and thunder, particularly in the north, with the best of the sunnier spells in the southeast. It will be windy at times, and some more persistent rain may reach northwestern parts on Saturday. Through the rest of the weekend and into the following week the northwest will have showers or longer spells of rain at times, with drier and brighter conditions generally in the southeast, although even here some bands of rain may move through. This weather pattern is quite likely to continue through the rest of the period. Temperatures starting rather cool, but recovering to around normal, and perhaps warm at times in the southeast.
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 will probably increasingly dominate, with some longer dry spells, particularly for northwestern areas compared to much of August. However there are also likely to be some more changeable weather at times in the north and northwest with outbreaks of rain and local gales, with these conditions perhaps extending southeastwards at times. Temperatures by day are likely to be generally warmer than average, especially for the southeastern half of the UK but generally nearer normal further northwest, and there will be an increasing chance of chillier nights anywhere, as would be expected during September.
Met Office : SW : 2018-08-19T15:04:43