If you planning to travel to Belfast Harbor, Belfast, Maine, 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 9:43 AM. The temperature feels like 67.6 with a humidity level of 100 so dress accordingly. Cloud coverage is 83 percent with visibility at 2 percent. Today’s UV index is 5, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 5 MPH. At the end of the day don’t miss the sunset at 11:32 PM.