National Weather Service United States Department of Commerce

The warmest airmass of the season so far will impact the UP Sunday-Tuesday. Highs will be in the 90s for most. Muggy dew points in the 60s and low 70s will drive the heat index near/above 100. Overnight lows in the 60s and 70s will make cooling off more difficult. Thunderstorm chances Sunday with the warm and unstable airmass. 5-15% chance for severe thunderstorms.
Heat builds back into the area early next week. The highest heat risk is expected Monday and Tuesday with highs climbing into the 90s and heat indices in the upper 90s.