Today: There will be plenty of sunshine this morning. A breeze will develop though, and cloud will build later. Patchy rain or drizzle may affect western parts later but Cardiff and Monmouthshire will keep the sunshine and become pleasantly warm. Maximum temperature 20 °C.
Tonight: After a sunny evening in the southeast, cloud and drizzle will tend to spread overnight, though cooler clearer spells will develop in the north before dawn. Minimum temperature 11 °C.
Tuesday: Tuesday will be humid and cloudy for most, with some drizzle around, mostly in the morning. Warmer, brighter spells are likely in north and east Wales later. Maximum temperature 20 °C.
Outlook for Wednesday to Friday: Rain or showers are likely on Wednesday, particularly in the northwest. Thursday and Friday will be drier and brighter, but cooler as the breeze turns northwesterly.