If you planning to travel to Caernarfon Castle, Caernarfon, 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 3:53 AM. The temperature feels like 59.650000000000006 with a humidity level of 87 so dress accordingly. Cloud coverage is 86 percent with visibility at 8 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southwest at a speed of 22 MPH. At the end of the day don’t miss the sunset at 8:48 PM.