Philadelphia Weather in September

In Philadelphia, September brings very high daytime temperatures around 31°C (88°F), with nights cooling to 18°C (64°F). Expect quite a bit of rainfall this month.

Rainfall in Philadelphia in September

You can expect rain on around 7 days based on historical patterns, with 102 mm (4 in) average for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Philadelphia in September

If you're visiting Philadelphia in September, expect highs of 31°C (88°F) and overnight lows around 18°C (64°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights cool down to 18°C (64°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

For Philadelphia itself, March, April, May and October generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.

Philadelphia Temperature in September

Min Temperature 18°C (64°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 25%  

Precipitation 102 mm (4 in)  

Rainy days 7 days  

What to Wear in Philadelphia in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho.

What To Do in Philadelphia in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.

More climate data for Philadelphia

Temperature Rainfall

See the full Philadelphia climate overview or explore weather in the United States of America.