September weather forecast
Berwyn, PA

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Weather in September

September, the first month of the autumn in Berwyn, is still a warm month, with an average temperature varying between 59.5°F (15.3°C) and 75.9°F (24.4°C).

Temperature

Berwyn's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's warm 82.9°F (28.3°C) to a still moderately hot 75.9°F (24.4°C). An average temperature of 59.5°F (15.3°C) marks the nights in September.

Humidity

The average relative humidity in September in Berwyn is 76%.

Rainfall

In September, the rain falls for 11.9 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. Throughout the year, there are 138.1 rainfall days, and 20.79" (528mm) of precipitation is accumulated.

Snowfall

In Berwyn, Pennsylvania, snow does not fall in June through September.

Daylight

The average length of the day in September in Berwyn is 12h and 26min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Berwyn, is 75.9°F (24.4°C), while the low-temperature averages to 59.5°F (15.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 76%.

How much does it rain in September?

In September, the rain falls for 11.9 days. Throughout September, 1.34" (34mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

In Berwyn, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In September, the average day length is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

How long on average sun shines in September?

In Berwyn, the average sunshine duration in September is 8.5h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Berwyn, PA

Average temperature in September - Berwyn, PA
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in September: 59.5°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Berwyn, PA

Average pressure in September - Berwyn, PA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Berwyn, PA

Average wind speed in September - Berwyn, PA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September
Berwyn, PA

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

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April, July and August (73%).

Average rainfall in September
Berwyn, PA

Average rainfall in September - Berwyn, PA
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is August (2.72").
The driest months (with the least rainfall) are January, February and November (1.3").

Average rainfall days in September
Berwyn, PA

Average rainfall days in September - Berwyn, PA
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in September
Berwyn, PA

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

The month with the highest snowfall is March (1.93").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Berwyn, PA

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

The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Berwyn, 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 3min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in September
Berwyn, PA

Average sunshine days in September - Berwyn, PA
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is July (12.7 days).

Average UV index in September
Berwyn, PA

Average UV index in September - Berwyn, 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, March, November and December (UV index 2).

Average cloud cover in September
Berwyn, PA

Average cloud cover in September - Berwyn, PA
  • Average cloud cover in September: 41

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Berwyn, PA

Average visibility in September - Berwyn, PA
  • Average visibility in September: 5mi

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

Berwyn, Pennsylvania, USA

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