If you planning to travel to SeaTac, Washington, 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 12:46 PM. The temperature feels like 76.15 with a humidity level of 49 so dress accordingly. Cloud coverage is 85 percent with visibility at 15 percent. Today’s UV index is 5, don’t forget the sunscreen if you need it! Today’s winds are traveling east-southeast at a speed of 8 MPH. At the end of the day don’t miss the sunset at 3:45 AM.