5 Free Ways to Keep Cool This Summer in Central Minnesota The month of June is off to a really hot start. Highs will be around 90 for a solid week, and it will be really important to keep cool to avoid heatstroke or exhaustion. If you are looking for some ways to keep cool without spending a dime, here are five options. 1. Mall Walk Head to the Crossroads Center Mall and take a couple of loops around the building. The mall is nice and cool, and it's a great way to get some light exercise while avoiding the extreme heat. Plus you can always window shop while you are there.