High pressure will be the dominating feature this week leading to more in the way of dry, settled and fine weather. We do have the small matter of some rain across Northern Ireland, Scotland, Northern parts of England and Western areas Tuesday into Wednesday as we see a weakening frontal system plague these areas. There will also be cooler air moving into the northern half of the United Kingdom albeit temporarily.
The good news is high pressure will quickly reassert its self with long spells of sunshine, plenty of blue sky and warmer temperatures Thursday onwards and more so during the weekend period.
We may just see highs reach the low twenties widely this weekend. The charts below show high pressure building this week and into the weekend period. Charts used: GFS and ECMWF model, temperature charts from the GFS model.