September weather forecast
Bethlehem, PA

A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania
A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania

Weather in September

September, the first month of the autumn in Bethlehem, is also a moderately hot month, with an average temperature varying between 55°F (12.8°C) and 74.3°F (23.5°C).

Temperature

In September, the average high-temperature slightly decreases from 81°F (27.2°C) in August to a still moderately hot 74.3°F (23.5°C). In Bethlehem, the average low-temperature is 55°F (12.8°C).

Humidity

In Bethlehem, the average relative humidity in September is 79%.

Rainfall

The month with the least rainfall in Bethlehem is September, when the rain falls for 11.8 days and typically collects 1.57" (40mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

Sunshine

The average sunshine in September in Bethlehem is 8.8h.

UV index

In Bethlehem, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Bethlehem?

The average high-temperature, in September, in Bethlehem, Pennsylvania, is 74.3°F (23.5°C), while the average low-temperature is 55°F (12.8°C). in August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is appraised at 86°F (30°C).

What is the average humidity in September in Bethlehem?

The average relative humidity in September in Bethlehem, Pennsylvania, is 79%.

What is the driest month in Bethlehem?

September is the month with the least rainfall in Bethlehem, Pennsylvania. Rain falls for 11.8 days and accumulates 1.57" (40mm) of precipitation.

How much does it rain in Bethlehem in September?

In Bethlehem, Pennsylvania, in September, during 11.8 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

When it does not snow in Bethlehem?

June through September are months without snowfall in Bethlehem, Pennsylvania.

Does it snow in Bethlehem in September?

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

What is the average length of the day in September in Bethlehem?

In September, the average day length in Bethlehem, Pennsylvania, is 12h and 27min.

When is the sunrise / sunset in September in Bethlehem?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:34 pm. On the last day of the month, in Bethlehem, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

How long on average sun shines in September in Bethlehem?

In Bethlehem, the average sunshine duration in September is 8.8h.

What is the UV index intensity in September in Bethlehem?

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

Average temperature in September
Bethlehem, PA

Average temperature in September - Bethlehem, PA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

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Average pressure in September
Bethlehem, PA

Average pressure in September - Bethlehem, 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).

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Average wind speed in September
Bethlehem, PA

Average wind speed in September - Bethlehem, PA
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Bethlehem, PA

Average humidity in September - Bethlehem, PA
  • Average humidity in September: 79%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

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Average rainfall in September
Bethlehem, PA

Average rainfall in September - Bethlehem, PA
  • Average rainfall in September: 1.57"

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in September
Bethlehem, PA

Average rainfall days in September - Bethlehem, PA
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in September
Bethlehem, PA

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

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Bethlehem, PA

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

The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Bethlehem, PA
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in September: 8h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in September
Bethlehem, PA

Average sunshine days in September - Bethlehem, PA
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

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Average UV index in September
Bethlehem, PA

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

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

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Average cloud cover in September
Bethlehem, PA

Average cloud cover in September - Bethlehem, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).

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Average visibility in September
Bethlehem, PA

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

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

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