Some thoughts from TheWeatherOutlook.
And the Outlook from the metoffice
Outlook for Tuesday to Thursday:
Plenty of dry weather throughout mid-week, with the sunniest and hottest weather in the southeast of the UK. Some showery rain is possible, mainly in the north and west.
UK Outlook for Thursday 26 Jul 2018 to Saturday 4 Aug 2018:
From Thursday and through the following weekend a west/east split in the weather is likely, with the west seeing cloudier, windier conditions with some rain at times, whilst central and eastern areas stay largely fine and settled, but with the risk of some thundery showers. Widely very warm or hot in the south and southeast, with warm and humid nights, whilst western areas may turn cooler and fresher later. Through the rest of the period there'll be plenty of fine weather, but occasional rain in the west may spread to other parts at times, and there'll be an ongoing risk of thunderstorms, particularly across central, southern and southeast England. Temperatures generally very warm away from the west, with hot or very hot conditions at times, especially in the southeast.
UK Outlook for Sunday 5 Aug 2018 to Sunday 19 Aug 2018:
Throughout this period it seems most likely that the weather pattern will only change very slowly. Western and southern areas will often be dry, sunny and very warm, but with the risk of some cloudier periods with rain at times, or heavy showers and thunderstorms. Further north and east drier and more settled conditions are expected to be more dominant, although with the ongoing risk of heavy showers and thunderstorms breaking out at times. Temperatures remaining widely above average for most, with further spells of very warm or hot conditions probable, and possible very hot conditions at times, especially in the southeast.