"Isolated gusts over 50 miles per hour are possible across the western coast of Wales as well as the southwestern coasts of England". The wind warning was issued earlier this morning and it come into effect at 2:00pm today, September 12.
Gusts of between 55mph and 60mph on Monday morning could see disruption to rush hour traffic, particularly over the Severn Bridge, with difficulties for high-sided vehicles and possible speed restrictions.
In the days ahead, the weather will remain unsettled, though there will be dry periods as the rain is mostly due to be in the form of showers.
Met Éireann has issued another weather warning with strong and blustery winds set to batter the country tomorrow afternoon.
A separate alert is in place across the Midlands, Yorkshire and much of the north on Tuesday evening into Wednesday.
Although the forecast looks quieter for the rest of Monday, Sky News weather presenter Isobel Lang said "wild and windy" conditions are set to return on Tuesday and Wednesday.
The Met Office said winds could gust up to 75mph in exposed places from 20:00 on Tuesday until 10:00 on Wednesday.
Nearly half of the average rainfall for September could fall in six to nine hours from about 4pm on Tuesday, which "seems likely to lead to flooding of some sections of road and perhaps also properties", the Met Office said.
There is also a small chance of power cuts, and some damage to buildings such as tiles blowing off roofs, the Met Office said.
Temperatures will dip below average for the time of year with highs of just 19C (66.2F) in the south and 15C (59F) elsewhere.
"Normally winds of this strength would cause very few impacts".