This is the outlook for the next four weeks using the JMA model issued from the Japanese Met Agency. This is not meant to be a forecast but a general outlook. The blue colours are below average pressures and oranges above average pressures. I have added the 3 images together, rotated them and added a red line so you can see the UK.
Week 1 9th August to 15th.
During this period low pressure is mainly in control. This period will see rainfall slightly above average with temperature 1-2 degrees below what you would expect for early August.
Week 2 16th August to 22nd.
Very little change during this period, will still see slightly above average rainfall with temperature a little cooler than you would expect.
Week 3-4 23rd August to 5th September.
This is a two week period, we will start to see a slight improvement with temperatures and rainfall around average.