September weather forecast
New Carrollton, MD

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Weather in September

September brings the advent of the fall season in New Carrollton. However, the temperatures, while slightly reduced, retain some vestiges of the summer warmth. The weather starts taking on a cooler demeanor with the average highest temperature residing at 78.1°F (25.6°C). A continued shortening of daylight hours further pronounces the imminent seasonal shift. This period marks the onset of autumnal transformation that will become more apparent in the following month.

Temperature

The beginning of September subtly marks a decrease in the average high-temperature, transitioning from 85.1°F (29.5°C) in August to a still moderately hot 78.1°F (25.6°C). An average low-temperature of 62.2°F (16.8°C) is recorded during the nights in September.

Humidity

In New Carrollton, the average relative humidity in September is 74%.

Rainfall

In New Carrollton, Maryland, during September, the rain falls for 12.3 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 157.9 rainfall days, and 31.14" (791mm) of precipitation is accumulated.

Snowfall

May through November are months without snowfall.

Daylight

In New Carrollton, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 5 during September translates into the following guidance:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

September temperatures vary between a high-temperature of 78.1°F (25.6°C) and a low-temperature of 62.2°F (16.8°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is computed to be 93.2°F (34°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

How much does it rain in September?

In September, the rain falls for 12.3 days. Throughout September, 2.09" (53mm) of precipitation is accumulated.

When it does not snow in New Carrollton?

In New Carrollton, snow does not fall in May through November.

What is the average length of the day in September?

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

When is the sunrise / sunset in September in New Carrollton?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

How many hours of sunshine does New Carrollton have in September?

In New Carrollton, the average sunshine duration in September is 9.1h.

What is the UV index reading in September in New Carrollton?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health risk 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
New Carrollton, MD

Average temperature in September - New Carrollton, MD
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in September: 62.2°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in September
New Carrollton, MD

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

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
New Carrollton, MD

Average wind speed in September - New Carrollton, MD
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September
New Carrollton, MD

Average humidity in September - New Carrollton, MD
  • Average humidity in September: 74%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in September
New Carrollton, MD

Average rainfall in September - New Carrollton, MD
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in September
New Carrollton, MD

Average rainfall days in September - New Carrollton, MD
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is November (9 days).

Average snowfall in September
New Carrollton, MD

Average snowfall in September - New Carrollton, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September, October and November (0").

Average snowfall days in September
New Carrollton, MD

Average snowfall days in September - New Carrollton, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.1 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
New Carrollton, MD

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

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 0min).

Average sunshine days in September
New Carrollton, MD

Average sunshine days in September - New Carrollton, MD
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September
New Carrollton, MD

Average UV index in September - New Carrollton, 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 and December (UV index 2).

Average cloud cover in September
New Carrollton, MD

Average cloud cover in September - New Carrollton, MD
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
New Carrollton, MD

Average visibility in September - New Carrollton, 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).

New Carrollton, Maryland, USA

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