That Heat Advisory the National Weather Service put out Sunday night at 8:56 doesn't expire until 8 tonight, and it's earning its keep. Tonight's low only drops to 78, but the real number is the heat index — as high as 105 overnight. That's not a typo. Muggy, still air after a hot day means the body doesn't get much of a break even after the sun's down.
Monday brings the headline number: mostly sunny, high near 95, with a heat index up to 99 thanks to a west-northwest wind at 5 to 15 mph that won't do much cutting through the humidity. If you've got outdoor plans — yard work, a run, kids at the park — push them to early morning or wait for evening. Pavement and turf hold heat all afternoon, so it'll feel every bit as hot as advertised whether you're at Hyland Park or walking to the light rail.
Monday night eases off some, mostly cloudy with a low around 70 and a heat index still up to 95, so the advisory logic carries even after it technically lapses at 8pm. Tuesday backs down to a more livable 89 under sunny skies with light wind, and Tuesday night drops to 70. Don't get too comfortable — Wednesday climbs back to 92 with sun and a light south wind, so this heat isn't finished with the metro yet.