SSEN's Weather Watch for September 2020
For the three month summer season, it was fractionally warmer than average for the UK but over 1C above average for south east England. The Met Office rainfall anomaly map (above) shows most places were wetter than average and notably for north west England, south west Scotland and Northern Ireland. The exceptions were northern Scotland and south east England which were drier than the 30 year climate average. Skies were often cloudy, notably for Wales and Northern Ireland, and the UK as a whole recorded 89% of average sunshine levels.
September looks to be an unsettled month overall, notably for Scotland, with frequent windy and wet spells making for a changeable start to the autumn season. Areas of low pressure will often impact the north of the country and the prevailing wind directions will likely be westerly, occasionally north westerly. As a result, it’s likely to be a cooler than average month, although some warm and sunny interludes will develop but these are unlikely to be prolonged in any one location.
The MetDesk map - on the main page - shows the five day average weather pattern starting on 12 September. Low pressure is centred near Reykjavík in Iceland, and the high pressure is found on the far eastern side of mainland Europe. The numbers shows the average temperature (Celsius) and the colour coding indicates how the temperatures compare to average. The blue shadings across Iceland, Norway, Ireland, the UK, Spain and Portugal give signals for below average temperatures, whereas the warmer than average values are confined to central and notably north east Europe (orange colours).
The month of September is also likely to be very active in terms of tropical storms and hurricanes in the Caribbean Sea, and these will sometimes impact parts of Central America, the Gulf of Mexico and the USA. There is also an elevated risk of one or more tropical storms recurving in to the Atlantic and impacting parts of north west Europe.
Later on in the autumn we could find high pressure being the dominant player to western Europe, so we’ll be back in a few weeks to see how the signals are progressing for a change of weather pattern.
For more weather information you can follow our meteorologist, Simon Cardy on twitter @weather_king.