Weather map shows exact date 'rain bomb' hits UK - only 7 UK counties not affected

Brits are being warned to on Sunday, May 18, with much of the UK expected to be hit by a . Latest long-range weather modelling from reveals widespread rainfall sweeping across England, Wales, Northern Ireland and parts of Scotland, with only a few counties expected to remain dry.

According to the 24-hour accumulated precipitation forecast, most areas across the UK will receive between 1 and 5mm of rain on the day. The rainfall follows a prolonged spell of relatively dry and settled weather across much of the country.

Met Office forecasts had previously predicted a stretch of high pressure dominating conditions between 8 to 17 May, bringing fine, dry days and some chilly nights.

However, their outlook for the latter half of the month warns of more typical springtime volatility, with an increased chance of heavy rain and isolated thunderstorms.

The WXCharts map confirms this shift, showing rain likely in most counties across England and Wales, including Manchester, Birmingham, Norwich, Cardiff, and Plymouth. The majority of Northern Ireland and western Scotland also appear in the firing line.

Counties not affected by the May 18 "rain bomb":

Essex

Hertfordshire

Kent

West Sussex

East Sussex

Surrey

Isle of Wight

The Met Office notes that while warmer-than-average temperatures are still expected in sunnier spells, the risk of sudden, heavy rain and stormy conditions will increase toward late May.

With spring weather proving anything but predictable, forecasters are urging people to keep an eye on local updates as the weekend approaches.

For those planning outdoor events or travel on the 18th, it may be wise to pack both suncream and a sturdy umbrella.