This is the latest outlook for the next four weeks from the Japanese Met Agency the JMA. It is not meant to be a forecast but a general outlook. I have added the 3 images together and rotated them and added a red line so you can see the UK. Blue colours are low pressure area’s and oranges high pressure area’s.
Week 1, 17th to 23rd October.
Low pressure is over the UK and it looks like overall we will see a northerly airflow. The first part of this period will see a fair amount of rain becoming drier next week. Scotland will see above average rainfall and the rest of the UK will be around average. Temperature will be around average or just slightly cooler for this time in October.
Week 2, 24th to 30th October.
A small high air pressure area is located over the UK. It looks like the weather will be fair and settled for a few days. With the area of the high air pressure being small there is some uncertainty how long the settled weather will last. So I would expect the first part of this period will be dry and temperatures will be around average maybe slightly above average. But I could see a change taking place before the end of this period.
Week 3-4, 31st October to 13th November.
Low pressure is in the Atlantic just to the West of the UK. The air pressure will be fairly slack over the UK. I would expect there to be a South-westerly airflow and this will bring very showery conditions leading to above average rainfall. Temperatures will be around average for early November.