Heat expected to beat record, change Philadelphia October weather history

PHILADELPHIA — The region is dealing with “unseasonably hot temperatures” that will be “approaching or exceeding daily records over much of the area,” according to the National Weather Service.

Also, “expect highs to reach or exceed 90 over the urban corridor, southern New Jersey and Delmarva.”

How rare is that?

These were the predicted high temperatures as of Tuesday night:

The National Weather Service is now calling for 93 degrees in Philadelphia.

And these are the predicted temperatures at 2pm Wednesday:

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The temperature hasn’t been this high in awhile. Click here for tips on staying safe and cool, from an article written over the summer, when the heat was expected and lasted longer.

Be careful if you want to cool off at the shore. There’s a Small Craft Advisory in effect through late Thursday night.

Later, a cold front and possibly secondary low “may help spark some showers and thunderstorms” in the northern part of our region. The rain is not expected to be severe.

Overnight, there will be lots of cloud cover.

Then, as the National Weather Service put it:

“What a difference a day will make!”


“A relatively shallow wedge of cool air will undercut the warm humid air. … We are anticipating maximum readings in the 60s from southeastern Pennsylvania into southern New Jersey, and highs only in the 50s from the Poconos and parts of the Lehigh Valley into northern New Jersey.”


“Periods of rain and low clouds are likely on Thursday from eastern Pennsylvania into northern and central New Jersey.”

Later, into the weekend,

“We are expecting a decrease in clouds for Friday and mostly sunny conditions on Saturday. Both days will likely feature temperature readings that are typical of early autumn. Lows may get into the middle 30s early on Saturday morning in the Poconos and in far northern New Jersey. However, there may be enough wind to prevent the development of widespread frost.”

Early next week,

“Temperatures are expected to creep back upward to slightly above normal for Sunday and Monday.” After a Monday night cold front, expect “readings falling to slightly below normal on Tuesday.”

That means Philadelphia won’t get close to 80 degrees for the next six days.

Over the past 20 years, from 2000 to 2019 (so far, as of Oct. 2), the average October high temperature in Philadelphia was 83, with the highest of 89 in 2007, and the lowest of 77 in 2004.

The average October low temperature over that time in Philadelphia was 38, with the highest of 65 in 2019 — previously 42 in 2017 — and the lowest of 31 in 2011.

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