High humidity will once again send AccuWeather RealFeel temperatures dangerously past the triple-digit mark in Washington, D.C., Philadelphia and New York City.

People are urged to drink plenty of water, stay in cool locations and avoid strenuous activities, especially during the midday and afternoon hours."It is very easy to be overcome by the heat this time of the year," said AccuWeather Senior Meteorologist Alex Sosnowski. "If you must work outdoors, be sure to take frequent breaks and increase your intake of water and electrolyte balancing fluids."Temperatures will drop a few degrees today as a cold front approaches and leads to more clouds, as well as spotty showers and thunderstorms in the mid-Atlantic and interior New England. Humidity will remain uncomfortable for most.True relief from the heat will come after that front swings through by midweek."Some places are experiencing their hottest conditions of 2015 from the weekend into early this week, so the sharp frontal passage forecast to occur on Tuesday will bring welcomed relief," said AccuWeather Meteorologist Ben Noll.The change in the weather will be quite noticeable on Wednesday across much of the Northeast as humidity lessens considerably," Noll said.High temperatureson Wednesday will alsobe back to more typical mid-July highs. Residents may opt to give their air conditioners and fans a break.It will actually be several days before those air conditioners and fans are needed again, according to Noll."The break from the excessive heat and humidity will probably linger into next weekend before another frontal boundary approaches," he said.