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 12:52 PM. The temperature feels like 47.15 with a humidity level of 80 so dress accordingly. Cloud coverage is 33 percent with visibility at 13.6 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southeast at a speed of 7 MPH. At the end of the day don’t miss the sunset at 9:56 PM.