This is the outlook for the next four weeks from the JMA the Japanese Met Agency. This is not a forecast but an outlook.
I have added the 3 images together rotated them and add a red line so you can see the UK. Blue colours are low pressure areas and oranges high pressure.
Week 1 15th June to 21st.
A ridge of high pressure builds over the UK This will bring mainly dry conditions with temperatures a couple of degrees above average.
Week 2 22nd June to 28th.
The JMA thinks a trough and low pressure will be over the UK. I think this will be slow to move in and it will be around half way through this period when it will become wetter with periods of heavy rain.
Week 3 29th June to 12th July.
Low pressure to the North of the UK and high pressure to the South. This period will see temperatures and rainfall around average.