September weather forecast
Langhorne, PA

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Weather in September

September, the first month of the autumn in Langhorne, is also a moderately hot month, with an average temperature fluctuating between 76.5°F (24.7°C) and 59.9°F (15.5°C).

Temperature

September brings a slight decrease in temperature, down from a warm 83.1°F (28.4°C) in August to a still moderately hot 76.5°F (24.7°C). During the month of September, the temperature in Langhorne generally drops to a low average of 59.9°F (15.5°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In September, the rain falls for 12.7 days. Throughout September, 1.93" (49mm) of precipitation is accumulated. Throughout the year, there are 154.4 rainfall days, and 31.38" (797mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall in Langhorne, Pennsylvania.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:43 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Guard yourself - Avoiding sunburn is suggested. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Langhorne in September?

The high-temperature, in September, in Langhorne, records 76.5°F (24.7°C), while the low-temperature is 59.9°F (15.5°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 76%.

How many days does it rain in September?

In Langhorne, in September, it is raining for 12.7 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow?

June through October are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:27 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.8h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Langhorne, PA

Average temperature in September - Langhorne, PA
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in September
Langhorne, PA

Average pressure in September - Langhorne, PA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Langhorne, PA

Average wind speed in September - Langhorne, PA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
Langhorne, PA

Average humidity in September - Langhorne, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in September
Langhorne, PA

Average rainfall in September - Langhorne, PA
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is July (3.66").
The driest month (with the least rainfall) is January (1.89").

Average rainfall days in September
Langhorne, PA

Average rainfall days in September - Langhorne, PA
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is January (8 days).

Average snowfall in September
Langhorne, PA

Average snowfall in September - Langhorne, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.99").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Langhorne, PA

Average snowfall days in September - Langhorne, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Langhorne, PA

Average daylight in September / Average sunshine in September - Langhorne, PA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in September
Langhorne, PA

Average sunshine days in September - Langhorne, PA
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.9 days).

Average UV index in September
Langhorne, PA

Average UV index in September - Langhorne, PA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Langhorne, PA

Average cloud cover in September - Langhorne, PA
  • Average cloud cover in September: 37

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Langhorne, PA

Average visibility in September - Langhorne, PA
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Langhorne, Pennsylvania, USA

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