The agency’s forecast for Monday to Wednesday next week says thunder could also be a feature as the weather takes another turn.
It reads: “Mostly dry Monday with sunny spells, some showers developing later, risk of thunder. Turning wet on Tuesday and Wednesday, mainly in the west. Generally warm, sometimes very warm and humid.”
Met Office weather maps show rain hitting as far south as Cornwall and Devon, and as far north as Moray in Scotland.
The rain forecast comes as the Met Office says warm weather will arrive this weekend.
Met Office Deputy Chief Meteorologist Greg Wolverson said the improving conditions are being driven by a change in the jet stream.
He said: “As we move into the weekend, the jet stream temporarily shifts northwards, allowing high pressure to build from the south,” he said.
“This brings a drier and warmer weekend for many. Saturday will see a more settled day of weather across southern areas, with some sunny spells developing. Temperatures here could reach 22-23C.
“Sunday looks set to be widely dry across the UK, with further sunshine and temperatures continuing to rise. The warmest spots are likely across southern England where temperatures may reach 23-24C, bringing a notably warmer feel compared to earlier in the week.”