It will be a dry start with heavy rain later. Here is the full forecast for Wales:
Monday morning will be clear and dry, but a heavy band of rain will affect the west and south of the country throughout the afternoon. There will be a high chance of fog in higher areas throughout the day. Maximum temperature 15 °C.
Tonight, overnight it will be dry, with a few showers in the south. The risk of highland fog will continue overnight. Temperatures will feel a little higher than last night. Minimum temperature 10 °C