Unseasonable warmth for early September will continue along much of the Atlantic Seaboard into Saturday with tens of millions now back in school and work.
The combination of temperature, humidity, sunshine, light winds and other factors will push AccuWeather RealFeel® temperatures from Atlanta and Savannah, Georgia, to Philadelphia and New York City past the 90-degree mark most days this week.
On occasion, RealFeel temperature will approach 100 F for a few hours during the late morning and afternoon in some cities.
Another surge of heat and humidity will push northward by Friday.
New York City had its hottest day of the summer on Tuesday with a high of 92 F. RealFeel temperatures climbed well above 100 F at Atlanta, Charlotte, North Carolina, and Richmond, Virginia, on Tuesday.
Most nights will remain uncomfortably warm and humid, especially in urban areas along the Interstate 95 corridor this week.
The combination of high and low temperatures through Saturday will average about 10 degrees above normal.
The conditions, more typical of mid-July, will cause difficulties for those with respiratory problems and those who do not have air conditioning.
Adding to the difficulties during a September heat wave, many public pools have closed for the season and some beaches no longer have lifeguards on duty.
Avoid strenuous activity during the late-morning and afternoon hours, when the sun is the strongest and RealFeel temperatures are the highest. Avoid swimming at beaches where lifeguards are not on duty.
Temperature and humidity levels will fluctuate on a day-to-day basis in northern areas, but much less so near the coast and practically not at all in the South.
A brief push of slightly cooler, less humid air has expand into the Northeast on Wednesday and will continue into Thursday.
According to AccuWeather Long Range Weather Expert Paul Pastelok, "The unseasonable warmth and high humidity will continue through Saturday over much of the South."
After a slight dip in temperatures and humidity levels Wednesday into Thursday, both will spike Friday into Saturday.
Relief from the Delmarva Peninsula to the Carolinas and northern Georgia will have to wait until later this coming weekend, when a stronger push of cooler and less humid air will arrive and will reach through the mid-Atlantic and part of the South.
"The very warm and humid conditions will expand northward yet again before the middle of the month," Pastelok said.
The end result will have more warm days, compared to cool days, compared to average for the first half of September.
"Near or just beyond the middle of the month, we expect a strong push of chilly air to expand southeastward from Canada," Pastelok said.
"It is possible the air mass at mid-month will be chilly enough for frost and perhaps an end to the growing season in parts of the Midwest and the interior Northeast."
In much of the South and the East, this Labor Day was the warmest of the unofficial summer holidays this year. By the end of the week, this week may end up being the warmest week of the summer in the East.
Comments that don't add to the conversation may be automatically or manually removed by Facebook or AccuWeather. Profanity, personal attacks, and spam will not be tolerated.
Drenching rain will converge on much of the Hawaiian Islands and raise the risk of flash flooding early this week.
Atmospheric conditions over the western Caribbean Sea may harbor tropical storm formation toward the end of October.
Life-threatening rain and wind from Typhoon Lan will last into Monday in Japan.
Rain capable of causing travel disruptions and storms strong enough to knock down trees will push across the southern United States into Monday.
The Los Angeles Dodgers and Houston Astros will battle for the 2017 World Series title beginning on Tuesday at Dodgers Stadium amid extreme heat.
A brief, but major change to autumn weather in the southern United States will be accompanied by a dose of heavy rain and thunderstorms into Monday.
While most of the games in week 7 won't deal with inclement weather, fans in a few cities may want to have rain gear.
The dangers to lives and property will already be mounting across Japan on Sunday’s Election Day prior to Lan slamming onshore at night.