September weather forecast
Bethlehem, MD

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Bethlehem, Maryland, with an average temperature fluctuating between 77.4°F (25.2°C) and 63.5°F (17.5°C).

Temperature

September's arrival signals a moderate reduction in the average high-temperature, easing from a warm 82.9°F (28.3°C) in August to a still moderately hot 77.4°F (25.2°C). Bethlehem reports a consistent average low-temperature of 63.5°F (17.5°C) throughout September nights.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In September, the rain falls for 11.3 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 130 rainfall days, and 15.04" (382mm) of precipitation is accumulated.

Snowfall

In Bethlehem, snow does not fall in May through October.

Daylight

In Bethlehem, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:47 pm EDT.

Sunshine

In Bethlehem, the average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 5 suggests these recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.

Frequently asked questions

What is the average September temperature?

An average high-temperature, in September, in Bethlehem, is 77.4°F (25.2°C) and the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, in August is computed to be 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

How many days does it rain in September?

In Bethlehem, in September, it is raining for 11.3 days, with typically 0.79" (20mm) of accumulated precipitation.

When it does not snow?

In Bethlehem, snow does not fall in May through October.

What is the average length of the day in September?

The average day length in September in Bethlehem is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:33 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:47 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.4h.

What is the UV index reading in September?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
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
Bethlehem, MD

Average temperature in September - Bethlehem, MD
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).

Average pressure in September
Bethlehem, MD

Average pressure in September - Bethlehem, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Bethlehem, MD

Average wind speed in September - Bethlehem, MD
  • Average wind speed in September: 7.1mph

The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

Average humidity in September
Bethlehem, MD

Average humidity in September - Bethlehem, MD
  • Average humidity in September: 77%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (73%).

Average rainfall in September
Bethlehem, MD

Average rainfall in September - Bethlehem, MD
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is January (0.75").

Average rainfall days in September
Bethlehem, MD

Average rainfall days in September - Bethlehem, MD
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (7.4 days).

Average snowfall in September
Bethlehem, MD

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

The month with the highest snowfall is January (0.59").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Bethlehem, MD

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

The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Bethlehem, MD
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

Average sunshine days in September
Bethlehem, MD

Average sunshine days in September - Bethlehem, MD
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (13 days).

Average UV index in September
Bethlehem, MD

Average UV index in September - Bethlehem, MD
  • Average UV index in September: 5

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 and December (UV index 2).

Average cloud cover in September
Bethlehem, MD

Average cloud cover in September - Bethlehem, MD
  • Average cloud cover in September: 33

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Bethlehem, MD

Average visibility in September - Bethlehem, MD
  • Average visibility in September: 6mi

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

Bethlehem, Maryland, USA

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