Temperature in Pennsylvania in September

Daytime highs, nighttime lows and the warmest cities in Pennsylvania, the United States of America this September.

Pennsylvania, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in September ranging from 21°C (70°F) in Mount Pocono to 26°C (79°F) in Philadelphia. Nighttime temperatures generally drop to 17°C (63°F) in Philadelphia and 11°C (52°F) in Mount Pocono.

What is the temperature of the different cities in Pennsylvania, the United States of America in September?

Find the average daytime temperatures in September for the most popular destinations in Pennsylvania on the map below. Click on a destination dot for more detailed information.

Select a Month

Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit Pennsylvania, check out our Pennsylvania's climate page.

See also: Pennsylvania weather by month.

Best Places to Visit in Pennsylvania in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Pennsylvania.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

See all September weather averages, cities and regions in Pennsylvania

Pennsylvania temperatures in September: frequently asked questions

How hot does it get in Pennsylvania, the United States of America in September?

Daytime temperatures in Philadelphia typically peak at 26°C (79°F) in September, putting it in the high range.

How cold does it get at night in Pennsylvania, the United States of America in September?

Nighttime temperatures in Philadelphia typically drop to around 17°C (63°F) in September.

What is the warmest city in September in Pennsylvania, the United States of America?

Data insights from our comprehensive database indicate that Philadelphia is the city with the highest warmth. Daytime peaks average near 26°C (79°F), while the nights are characterized by a low temperature close to 17°C (63°F).

What is the coldest city in September in Pennsylvania, the United States of America?

When looking through our records, we find that Mount Pocono stands out as the coolest city in Pennsylvania, the United States of America for the month of September. Daytime highs average 21°C (70°F) and it cools down to about 11°C (52°F) at night.

How much sun does Pennsylvania, the United States of America get in September?

The weather is predominantly sunny, with an estimated total of around 218 hours of sunshine in Philadelphia. This means many sunny days, which creates a cheerful atmosphere during this month.

What is the water temperature in September?

The water temperature averages approximately 22°C (72°F) in Philadelphia this month, good for swimming and cooling off.

Interested in more climate information?

We have much more information about the climate in Pennsylvania.

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