A hotter and more humid weekend is ahead, with highs in the 90s Sunday and heat index values near 100. Storm chances remain low but possible, with the best chance for stronger storms staying mostly outside the Chicago area. Toss in dew points in the 70s and that will lead to heat index values near 100 degrees for many. This means there is a small chance for a stronger storm or two somewhere in the area. Humidity values will remain on the muggy side, making it feel a bit hotter.