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Weather in September in Pennsylvania

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

What is the weather like in Pennsylvania in September?

Pennsylvania 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 to warm in Philadelphia at 26°C. Nighttime temperatures generally drop to 17°C in Philadelphia and 11°C in Mount Pocono.

Precipitation

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

Average sunshine

Meanwhile, Philadelphia enjoys approximately 218 hours of sunshine, offering a mostly sunny climate that adds a pleasant and vibrant feel to the month.

For specific regional insights in Pennsylvania for September, refer to the map provided below. For an in-depth overview of the yearly weather conditions, do visit our Pennsylvania climate page.

Where to go in Pennsylvania in September

Find more information for the most popular destinations in the Pennsylvania on the map below. Click on a destination dot for more detailes.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in September for the 5 most popular destinations in Pennsylvania?

Philadelphia

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

Philadelphia
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
20°C 
260 hours 
132 mm 
10 days 
26°C 
17°C 
218 hours 
108 mm 
8 days 
October   >> October
>>  
20°C 
10°C 
200 hours 
118 mm 
11 days 
Climate in Philadelphia

Pittsburgh

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

Pittsburgh
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
28°C 
17°C 
229 hours 
74 mm 
11 days 
24°C 
13°C 
197 hours 
78 mm 
11 days 
October   >> October
>>  
17°C 
7°C 
168 hours 
76 mm 
14 days 
Climate in Pittsburgh

Gettysburg

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

Gettysburg
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
29°C 
17°C 
285 hours 
95 mm 
12 days 
25°C 
13°C 
226 hours 
123 mm 
10 days 
October   >> October
>>  
19°C 
6°C 
199 hours 
125 mm 
11 days 
Climate in Gettysburg

York

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

York
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
17°C 
285 hours 
105 mm 
12 days 
26°C 
14°C 
226 hours 
123 mm 
9 days 
October   >> October
>>  
19°C 
7°C 
199 hours 
131 mm 
11 days 
Climate in York

Washington

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

Washington
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
28°C 
15°C 
229 hours 
78 mm 
11 days 
24°C 
11°C 
197 hours 
75 mm 
11 days 
October   >> October
>>  
17°C 
5°C 
168 hours 
82 mm 
14 days 
Climate in Washington

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

Is September the best time to visit Pennsylvania?

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

On average, the best time to visit Pennsylvania 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. Interested in the weather conditions in a specific month? Select the month below.

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  • 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.