BBC monthly outlook
Monday 24 April—Sunday 30 April
Cold and showery for a time, some rain later
Some really cold air will be spreading southwards on Monday, following a band of rain which will clear southern England in the evening. Wintry showers will follow to Scotland and northeast England, with snow to quite low levels. By Tuesday, cold northerly winds will be bringing sunny intervals and showers of rain, sleet and snow to many places. By Wednesday, the showers, still wintry in places, will mainly affect England, while the north and west turn drier. For Thursday and Friday, cloudier and less cold weather, with a little rain, will spread from the northwest, leading on to a mixed weekend - with most places seeing rain at some stage, especially the northwest.
Monday 1 May—Sunday 7 May
Early May warmth
After the unsettled weekend, settled weather looks set to develop in early May. High pressure will build over the country, bringing most areas several days of dry and warmer weather with some sunshine, although it may take some time to extend to northwest Scotland. Before the air warms up, however, there could be a couple of very chilly nights with ground frost. Winds are likely to turn south or southeasterly, while any threat of rain later in the week is likely to be focused towards southwestern parts.
Monday 8 May—Sunday 21 May
Often dry - but warm or cold?
For the middle fortnight of the month there is still likely to be a good deal of dry weather with sunny spells around, with high pressure staying in charge of the weather pattern over the UK. Exactly where the high settles will have an important influence on the temperature. Although warm at times, such springtime highs tend to move westwards. This suggests that western parts will stay driest and sunniest, with the south and east most likely to catch any approaching bands of rain, but it may also mean that colder air will return on northerly winds at times.
Next week
A full look ahead at May 2017 - a spring or summer month this year?
http://www.bbc.co.uk/weather/2635167#outlook