If you planning to travel to Niagara Cave, Harmony, 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 12:07 PM. The temperature feels like 28.25 with a humidity level of 87 so dress accordingly. Cloud coverage is 92 percent with visibility at 9.9 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 12 MPH. At the end of the day don’t miss the sunset at 12:22 AM.