Pennsylvania weather in September
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.
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.
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. 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
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Popular destinations in Pennsylvania
What is the weather like in September for the 5 most popular destinations in Pennsylvania?
Average weather in 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.
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Average weather in 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.
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Average weather in 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.
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Average weather in 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.
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Average weather in 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.
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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.
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 climate conditions. Find out where to go with our weather planner.