If you planning to travel to William O'Brien State Park, Marine on St. Croix, Minnesota, 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 1:18 PM. The temperature feels like 26.25 with a humidity level of 88 so dress accordingly. Cloud coverage is 72 percent with visibility at 10 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 14 MPH. At the end of the day don’t miss the sunset at 10:36 PM.