 to the mid-Atlantic stage and the northeast region. Forecasters say oppressive heat and humidity are forecast to team up to spike temperatures up to 100 degrees in some states. This is townhall.com. Weather. Overnight, look for mostly fair skies, low around 53. Sunny on Sunday, 90 the high, 51 Sunday night for the low, and then 91 degrees on Monday. It's going to be a hot one. Check on your neighbors. Make sure you drink lots of water and don't get too overexerted.