This is the outlook for the next four weeks using the JMA issued by the Japanese Met Agency. This is just one model the JMA but followers will know that I normally publish it every Thursday or Friday. I have added the three images together and I have rotated them and added a red line so you can see the UK. Blue colours are low pressure areas and orange’s colours are high pressure areas.
Week 1 30th August to 5th September.
High pressure stretches from the East coast of North America across the Atlantic, over the UK onto Scandinavia and Russia. This will bring a fine settled spell of weather with mainly dry conditions. Temperatures over this week will be around average.
Week 2 6th September to 12th.
Not a great deal of change for the UK, there is now a gap in the high pressure across the Atlantic but the high pressure remains in place across the UK and Scandinavia. It will be mainly dry with temperature around average for early September.
Week 3-4 13th September to 26th.
We have to remember this is a two week period and it looks like some changes will now start to take place. High pressure still looks like it will be mainly in place but the low pressure trough in the North Atlantic will be moving down from Greenland and closer to the UK. This will start to introduce some showery conditions maybe rainfall will be slightly above average possibly during the later part of this period. Temperatures look to be around what you would expect for the final 3rd of September