If you planning to travel to Belfast Castle, Belfast, Northern Ireland, 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 8:07 AM. The temperature feels like 29.4 with a humidity level of 87 so dress accordingly. Cloud coverage is 81 percent with visibility at 14.9 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 8 MPH. At the end of the day don’t miss the sunset at 4:11 PM.