BBC monthly outlook
Monday 9 April—Sunday 15 April
Still wet for a time then turning more settled
An easterly wind flow will develop through the early part of next week and low pressure close to southern and western parts of the UK will produce areas of rain and drizzle. Many regions are likely to see further wet conditions at some stage and some of the rain will be heavy with the additional risk of lightning over SE England should warm, humid air over France fuel a few thunderstorms here. The easterly wind will be much less cold than recent easterly spells this year as this time the source of origin will be the eastern Mediterranean and eastern Europe rather than the Arctic.
The proximity of low pressure to the south could result in further rain to southern regions of the UK from middle part of next week on. Drier and calmer than usual conditions over more northern areas are expected as
high pressure over Scandinavia exerts enough influence to prevent any meaningful unsettled weather. Close to average temperatures for a time, then perhaps the chance of warmer conditions into the weekend.
Monday 16 April—Sunday 29 April
Settled for a time. Perhaps wet late April
Longer-range models indicate the continued migration of high pressure towards the UK during the middle of April. Although the exact pattern will very much be dependent on the orientation of that high, current indications suggest an easterly or perhaps south-easterly airflow continuing. Rather dry conditions are expected to predominate, with frontal systems expected to remain to the south-west of the UK by this point and then only weak features if they do make it to our shores. Temperatures are expected to remain around or slightly above average with any cool air from the north-east being offset by mild days.
As we look towards the end of April, there are some signs that high pressure will move away from the UK, allowing low pressure to become a more frequent visitor from the North Atlantic. Wetter and breezier conditions may return with a cooler feel to temperatures but there are some question marks over quite how unsettled it will be. Inevitably, the increasing strength of the sun may allow some heavy showers to develop too - a stark contrast to the drier weather expected through the middle of April.
Next Update
Will we see high pressure hanging on for longer than expected through late April?
https://www.bbc.co.uk/weather/outlook