Below is site has a few houses available for rent now and you can fill out a form to let them know what you are looking for. there may be more coming available by September. I also know that there may be some facebook groups for Fairmont where they post housing for rent and of course, there is always craigslist (look under Southwest Minnesota and put Fairmont in the search. here is a 3 bedroom with a lake view.https://mankato.craigslist.org/apa/d/3-bedroom-lake-home-for-rent/6610056687.html
http://www.dannyklous.com/