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Fox News Weather Center

Heat Wave to Begin September in NYC, DC, Philly

The calendar may be flipping to September but summer is not going anywhere just yet across the Northeast.

A push of summery heat and humidity will make its way into the Northeast this week, sending some thermometers back into the 90s alongside uncomfortable humidity levels for several days.

"One of the warmest weeks of the summer can be expected across the Northeast this week," said AccuWeather Meteorologist Dave Samuhel.

Much of the Interstate-95 corridor, including Washington, D.C., New York City, and Philadelphia, will have several consecutive days with temperatures in the 90s, marking an official heat wave for the area.

The jet stream will shift north creating a ridge of high pressure that will keep the heat in place for a while. This will also send storms farther north into Canada.

The heat will not only be confined to the Northeast. Above-average temperatures will stretch across the Midwest and Great Lakes region as well. Chicago, Detroit, and Indianapolis will have high temperatures this week 5 to 15 degrees Fahrenheit above normal.

The combination of the heat and high humidity will make for rather uncomfortable conditions outside this week. Those who must endure several hours working in these conditions are advised to stay hydrated and to take breaks in the shade or in an air-conditioned environment.

Heat is one of the leading weather-related killers in the United States each year and is something to take serious. There are several ways to help beat the heat, including wearing light-colored clothing and eating certain foods. Avoid leaving your child and pet alone in a car as well.

Despite the sun angle becoming lower each day as autumn gets closer, sunblock will still be needed for those expecting long exposure to the sun outside, including beachgoers. It will be an overall great week to head to the beach though.

This won't be the first heat wave experienced this summer as temperatures eclipsed 90 F for several days during the middle of August.

The interior Northeast and most of the Midwest will miss out on a heat wave, but temperatures will still be well above average. Cincinnati to Pittsburgh, Buffalo to Syracuse and across much of New England will have highs in the mid to upper 80s with perhaps a day or two reaching 90 F.

"Despite the heat, records are not expected to be broken in most of the Northeast," added Samuhel.

Most of the records for New York City and other areas are in the upper 90s to lower 100s.

"However, farther north into northern New England and eastern Canada, the heat will come much closer to records," said Samuhel.

Montreal, Ottawa, and Quebec City could come close to tying or even breaking records on a day or two this week, especially around midweek.

The heat will not just be confined to the daytime. Muggy and warm conditions at night this week will force windows to be kept shut and air conditioners to run continuously.

Most, if not all of this week will stay dry across the Midwest and Northeast with plenty of sunshine each day. The best chance for precipitation in the Northeast will likely not arrive until closer to the end of the week, and even that event will be rather spotty. Moisture from Tropical Rainstorm Erika is not expected to impact the Northeast.

Lawns may begin to turn brown due to the lack of rainfall. Some areas may even fall under the classification of a drought due to past dry conditions in August and the lack of rainfall expected ahead.

With the summer season set to end towards the latter half of September, the heat will naturally begin to slowly fade away as normal temperatures increasingly drop. However, the heat may hold on extra long this year.

"Long range signs point towards the heat sticking around past Labor Day," noted Samuhel.

The AccuWeather Fall Forecast is calling for dry and warm conditions for much of the Northeast.