September weather forecast
Marlow Heights, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Marlow Heights, Maryland, with an average temperature fluctuating between 78.4°F (25.8°C) and 61.9°F (16.6°C).

Temperature

Marlow Heights in September undergoes a slight reduction in the average high-temperature, shifting from August's 85.8°F (29.9°C) to a still moderately hot 78.4°F (25.8°C). Marlow Heights experiences an average low-temperature of 61.9°F (16.6°C) in the month of September.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Marlow Heights, in September, it is raining for 12.5 days, with typically 1.85" (47mm) of accumulated precipitation. In Marlow Heights, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.

Snowfall

In Marlow Heights, snow does not fall in April through November.

Daylight

In Marlow Heights, 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 in Marlow Heights is 9h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, an average UV index of 5 transforms into the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Marlow Heights in September?

During September, Marlow Heights experiences an average high-temperature of 78.4°F (25.8°C) and a low-temperature of 61.9°F (16.6°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is estimated at 95°F (35°C).

What is the average humidity in September in Marlow Heights?

In September, the average relative humidity is 74%.

How many days does it rain in September in Marlow Heights?

In Marlow Heights, in September, during 12.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow?

April through November are months without snowfall.

How many hours of daylight does Marlow Heights have in September?

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

When is the sunrise / sunset in September?

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 long on average sun shines in September?

In Marlow Heights, the average sunshine duration in September is 9h.

How high is the UV index in September?

In Marlow Heights, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe 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
Marlow Heights, MD

Average temperature in September - Marlow Heights, MD
  • Average high temperature in September: 78.4°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

Average pressure in September
Marlow Heights, MD

Average pressure in September - Marlow Heights, 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 (29.95"Hg).

Average wind speed in September
Marlow Heights, MD

Average wind speed in September - Marlow Heights, MD
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Marlow Heights, MD

Average humidity in September - Marlow Heights, MD
  • Average humidity in September: 74%

The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in September
Marlow Heights, MD

Average rainfall in September - Marlow Heights, MD
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").

Average rainfall days in September
Marlow Heights, MD

Average rainfall days in September - Marlow Heights, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).

Average snowfall in September
Marlow Heights, MD

Average snowfall in September - Marlow Heights, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.17").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Marlow Heights, MD

Average snowfall days in September - Marlow Heights, MD
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (3.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Marlow Heights, MD

Average daylight in September / Average sunshine in September - Marlow Heights, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Marlow Heights, MD

Average sunshine days in September - Marlow Heights, MD
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).

Average UV index in September
Marlow Heights, MD

Average UV index in September - Marlow Heights, MD
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September
Marlow Heights, MD

Average cloud cover in September - Marlow Heights, 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 30).

Average visibility in September
Marlow Heights, MD

Average visibility in September - Marlow Heights, MD
  • Average visibility in September: 6mi

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

Marlow Heights, Maryland, USA

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