If you planning to travel to St. Mary Lake, Glacier National Park, United States, 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 12:16 PM. The temperature feels like 38.650000000000006 with a humidity level of 71 so dress accordingly. Cloud coverage is 70 percent with visibility at 12.5 percent. Today’s UV index is 6, don’t forget the sunscreen if you need it! Today’s winds are traveling west-southwest at a speed of 18 MPH. At the end of the day don’t miss the sunset at 2:46 AM.