September weather forecast
Glenn Dale, MD

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Weather in September

September, the first month of the autumn in Glenn Dale, is still a warm month, with an average temperature ranging between min 62.8°F (17.1°C) and max 77.9°F (25.5°C).

Temperature

Start of September brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 84.4°F (29.1°C) to a still warm 77.9°F (25.5°C). Glenn Dale's September nights cool down to an average low-temperature of 62.8°F (17.1°C).

Humidity

In Glenn Dale, Maryland, the average relative humidity in September is 74%.

Rainfall

In Glenn Dale, in September, it is raining for 12.6 days, with typically 2.13" (54mm) of accumulated precipitation. Throughout the year, there are 156.7 rainfall days, and 31.81" (808mm) of precipitation is accumulated.

Snowfall

In Glenn Dale, snow does not fall in May through October.

Daylight

The average length of the day in September in Glenn Dale is 12h and 26min.
On the first day of September, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

Sunshine

In Glenn Dale, the average sunshine in September is 9.1h.

UV index

The average daily maximum UV index in September in Glenn Dale is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

An average high-temperature, in September, in Glenn Dale, is 77.9°F (25.5°C) and the average low-temperature is 62.8°F (17.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated 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 Glenn Dale, during September, the rain falls for 12.6 days and regularly aggregates up to 2.13" (54mm) of precipitation.

When it does not snow?

May 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 26min.

When is the sunrise / sunset in September?

On the first day of September in Glenn Dale, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.1h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Glenn Dale, MD

Average temperature in September - Glenn Dale, MD
  • Average high temperature in September: 77.9°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28°F).

Average pressure in September
Glenn Dale, MD

Average pressure in September - Glenn Dale, 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
Glenn Dale, MD

Average wind speed in September - Glenn Dale, MD
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in September
Glenn Dale, MD

Average humidity in September - Glenn Dale, MD
  • Average humidity in September: 74%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is April (71%).

Average rainfall in September
Glenn Dale, MD

Average rainfall in September - Glenn Dale, MD
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in September
Glenn Dale, MD

Average rainfall days in September - Glenn Dale, MD
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.9 days).

Average snowfall in September
Glenn Dale, MD

Average snowfall in September - Glenn Dale, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.36").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Glenn Dale, MD

Average snowfall days in September - Glenn Dale, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.3 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
Glenn Dale, MD

Average daylight in September / Average sunshine in September - Glenn Dale, 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
Glenn Dale, MD

Average sunshine days in September - Glenn Dale, MD
  • Average sunshine days in September: 16 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in September
Glenn Dale, MD

Average UV index in September - Glenn Dale, 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
Glenn Dale, MD

Average cloud cover in September - Glenn Dale, MD
  • Average cloud cover in September: 35

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
Glenn Dale, MD

Average visibility in September - Glenn Dale, 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).

Glenn Dale, Maryland, USA

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