It will stay warm and muggy overnight with temperatures only falling into the low 70s. Tomorrow and Thursday with light winds and a dome of high pressure building over us the heat will really be on and possibly even a record breaker by Thursday.  Read Alex's great blog about what is bringing about this heat.  Fortunately it won't last too long as a cool front sweeps across Friday and back to "normal" June warmth for this weekend. Get ready to be steamy next couple of days.