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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 3:24 PM. The temperature feels like 13.25 with a humidity level of 66 so dress accordingly. Cloud coverage is 61 percent with visibility at 6.6 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 32 MPH. At the end of the day don’t miss the sunset at 11:56 PM.