Allentown Weather in September

Allentown in September sees high daytime temperatures of 25°C (77°F) and nighttime lows of 13°C (55°F). Rainfall is fairly high this month at around 118 mm (4.6 in), so pack a rain jacket to stay dry.

Rainfall in Allentown in September

You can typically expect 10 days of rain this month, averaging around 118 mm (4.6 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Allentown in September

In September, expect high temperatures in Allentown, with highs of 25°C (77°F) and lows of 13°C (55°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 13°C (55°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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

Allentown Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 33%  

Precipitation 118 mm (4.6 in)  

Rainy days 10 days  

Humidity 74%  

What to Wear in Allentown in September

For Allentown in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.

What To Do in Allentown in September

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

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

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 Allentown's climate page.

More climate data for Allentown

Temperature Rainfall Humidity

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