If you planning to travel to Carmarthen Castle, Carmarthen, Wales, United Kingdom, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 8:24 AM. The temperature feels like 33.25 with a humidity level of 69 so dress accordingly. Cloud coverage is 6 percent with visibility at 14.9 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 21 MPH. At the end of the day don’t miss the sunset at 4:10 PM.