Philadelphia

Pennsylvania Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Pennsylvania, the United States of America in September.

Thinking about venturing to Pennsylvania, the United States of America this September and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Pennsylvania in September

Pennsylvania, the United States of America is a region in the United States of America. September in Pennsylvania generally has temperatures that range from pleasant to warm, with precipitation levels ranging from moderate to high.

Temperatures

The average maximum daytime temperatures vary from pleasant in Mount Pocono at 21°C (70°F) to warm in Philadelphia at 26°C (79°F). Nighttime temperatures generally drop to 17°C (63°F) in Philadelphia and 11°C (52°F) in Mount Pocono.

For a closer look at conditions across Pennsylvania, the United States of America, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Washington with an average of 75 mm (3 in) to high rainfall in Hummelstown with 140 mm (5.5 in).

Average sunshine

Plenty of sunshine can be expected in numerous places in September. Philadelphia typically receives 218 hours of sunlight, making it ideal for those seeking sunny weather.

Explore Pennsylvania by month

Pick a month to see the average temperature, rainfall and sunshine in Pennsylvania — and find the best time to visit. (based on Philadelphia)

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.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Pennsylvania

What is the weather like in September for some of the most popular destinations in Pennsylvania, the United States of America?

Temperature range in Pennsylvania (September)

Precipitation variation in Pennsylvania (September)

Philadelphia

In September Philadelphia generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 17°C (63°F) and high monthly rainfall. So on average the conditions are pleasant that month.

August
September
October
Max temperature
30°C (86°F)
26°C (79°F)
20°C (68°F)
Min temperature
20°C (68°F)
17°C (63°F)
10°C (50°F)
Monthly sun hours
260 hours
218 hours
200 hours
Monthly rainfall
132 mm (5.2 in)
108 mm (4.3 in)
118 mm (4.6 in)
Monthly rainy days
10 days
8 days
11 days
Weather conditions

Pittsburgh

In September Pittsburgh generally has high temperatures with maximum daytime temperatures around 24°C (75°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
28°C (82°F)
24°C (75°F)
17°C (63°F)
Min temperature
17°C (63°F)
13°C (55°F)
7°C (45°F)
Monthly sun hours
229 hours
197 hours
168 hours
Monthly rainfall
74 mm (2.9 in)
78 mm (3.1 in)
76 mm (3 in)
Monthly rainy days
11 days
11 days
14 days
Weather conditions

Gettysburg

In September Gettysburg generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 13°C (55°F) and high monthly rainfall. So on average the conditions are pleasant that month.

August
September
October
Max temperature
29°C (84°F)
25°C (77°F)
19°C (66°F)
Min temperature
17°C (63°F)
13°C (55°F)
6°C (43°F)
Monthly sun hours
285 hours
226 hours
199 hours
Monthly rainfall
95 mm (3.7 in)
123 mm (4.8 in)
125 mm (4.9 in)
Monthly rainy days
12 days
10 days
11 days
Weather conditions

York

In September York generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 14°C (57°F) and high monthly rainfall. So on average the conditions are pleasant that month.

August
September
October
Max temperature
30°C (86°F)
26°C (79°F)
19°C (66°F)
Min temperature
17°C (63°F)
14°C (57°F)
7°C (45°F)
Monthly sun hours
285 hours
226 hours
199 hours
Monthly rainfall
105 mm (4.1 in)
123 mm (4.8 in)
131 mm (5.2 in)
Monthly rainy days
12 days
9 days
11 days
Weather conditions

Washington

In September Washington generally has high temperatures with maximum daytime temperatures around 24°C (75°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
28°C (82°F)
24°C (75°F)
17°C (63°F)
Min temperature
15°C (59°F)
11°C (52°F)
5°C (41°F)
Monthly sun hours
229 hours
197 hours
168 hours
Monthly rainfall
78 mm (3.1 in)
75 mm (3 in)
82 mm (3.2 in)
Monthly rainy days
11 days
11 days
14 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Pennsylvania, in the United States of America.

Popular cities in September

Day & night temperatures, rainfall and average weather in Pennsylvania in September.

City Weather Day temp Night temp Rainfall
Philadelphia 26°C (79°F) 17°C (63°F) 108 mm (4.3 in)
Pittsburgh 24°C (75°F) 13°C (55°F) 78 mm (3.1 in)
Gettysburg 25°C (77°F) 13°C (55°F) 123 mm (4.8 in)
York 26°C (79°F) 14°C (57°F) 123 mm (4.8 in)
Washington 24°C (75°F) 11°C (52°F) 75 mm (3 in)
Bethlehem 25°C (77°F) 13°C (55°F) 113 mm (4.4 in)

Pennsylvania weather in September: frequently asked questions

What is the weather like in Pennsylvania, the United States of America in September?

In September, Pennsylvania, the United States of America generally has pleasant weather conditions. Philadelphia sees daytime temperatures near 26°C (79°F), with nights cooling to roughly 17°C (63°F).

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

Daytime temperatures in Philadelphia peak at roughly 26°C (79°F) in September, dropping to about 17°C (63°F) overnight.

Does Pennsylvania, the United States of America get a lot of rain in September?

Yes, September tends to be a wetter month in Pennsylvania, the United States of America. Average rainfall in Philadelphia sits around 108 mm (4.3 in).

Is September a Good Time to Visit Pennsylvania, the United States of America?

Given the typically pleasant weather conditions in Philadelphia, September might be a good time to visit Pennsylvania, the United States of America.

On average, the best time to visit Pennsylvania, the United States of America is in May with generally perfect weather in Philadelphia. On the other hand, the months of January, February and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Pennsylvania.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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