Denver weather forecast for today, June 18: Mostly sunny, mostly hot You probably won’t melt today. Ashley Dean Jun 18 2017 · 6:00 a.m. Jun 18 2017 · 6:00 a.m. Share Tweet Email A biker on the Cherry Creek Trail, June 6, 2017. (Kevin J. Beaty/Denverite) You probably won’t melt today. It’s going to be mostly sunny with a high around 81 and a light breeze, the National Weather Service reports. The overnight low will be around 55. So, business as usual. Carry on.