Click on the images for trends and more data:
flybubble.com/weather RASP based easy interface
Meteoblue Multi model – see if the different forecast models agree
NRW Whiteford Sands on the North Gower so hopefully useful for Rhossili
NRW Merthyr Mawr South of Bridgend so a coastal station possibly for Nant-Y-Moel
Long Mynd Soaring Club weather and webcams
Black Mountains Gliding club at Talgarth
South Wales Gliding Club at Usk
East of Brecon weather station
Satallite images from skylink-pro.com: InfraRed and Visual