The Met Office forecast shows rain pushing in from the west, but many eastern areas remis expected to remain dry and bright.
Monday evening there will be another band of showery rain, potentially heavy at times, is expected to develop across eastern parts of England, clearing on Tuesday morning.
Met Office Chief Meteorologist Matthew Lehnert said, “After a long spell of high pressure bringing dry weather and sunshine, gloomier and unsettled conditions are on the horizon. Low pressure has become established to the west of the UK bringing cloud, rain showers, and lower temperatures for many.
“More persistent and heavy rain is expected on Tuesday into early Wednesday. A low-pressure system near Portugal is of particular interest as it moves towards the UK, bringing with it potentially heavy rain and thunderstorms.
“We have issued a yellow warning for rain from midday on Tuesday until Wednesday afternoon. The warning covers southwest England, Wales, and the northwest of England.
“High rainfall totals are possible, but given the recent dry conditions, significant impacts are not anticipated. The situation remains under close watch, with further wet conditions anticipated on Thursday and another weather front moving in on Friday.”