September weather forecast
Aspen Hill, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Aspen Hill, Maryland, with an average temperature fluctuating between 60.8°F (16°C) and 78.1°F (25.6°C).

Temperature

September marks a gentle change in average high-temperature, declining from August's warm 84.9°F (29.4°C) to a still moderately hot 78.1°F (25.6°C). September sees the temperature falling to a mean low of 60.8°F (16°C).

Humidity

The average relative humidity in September is 74%.

Rainfall

In Aspen Hill, in September, it is raining for 12.5 days, with typically 2.24" (57mm) of accumulated precipitation. In Aspen Hill, during the entire year, the rain falls for 160.9 days and collects up to 32.99" (838mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

In Aspen Hill, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Guard yourself - An obligation to protect skin and eyes from harm exists. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Aspen Hill, is 78.1°F (25.6°C), while the low-temperature averages to 60.8°F (16°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is evaluated at 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How many days does it rain in September in Aspen Hill?

In Aspen Hill, in September, during 12.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

When it does not snow in Aspen Hill?

May through October are months without snowfall.

What is the average length of the day in September?

In Aspen Hill, 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 7:38 pm. On the last day of the month, in Aspen Hill, Maryland, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How long on average sun shines in September?

In Aspen Hill, the average sunshine duration in September is 8.9h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Aspen Hill, MD

Average temperature in September - Aspen Hill, MD
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in September
Aspen Hill, MD

Average pressure in September - Aspen Hill, 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
Aspen Hill, MD

Average wind speed in September - Aspen Hill, MD
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in September
Aspen Hill, MD

Average humidity in September - Aspen Hill, MD
  • Average humidity in September: 74%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in September
Aspen Hill, MD

Average rainfall in September - Aspen Hill, MD
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in September
Aspen Hill, MD

Average rainfall days in September - Aspen Hill, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in September
Aspen Hill, MD

Average snowfall in September - Aspen Hill, MD
  • Average snowfall in September: 0"

The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Aspen Hill, MD

Average snowfall days in September - Aspen Hill, MD
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (5.1 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
Aspen Hill, MD

Average daylight in September / Average sunshine in September - Aspen Hill, 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Aspen Hill, MD

Average sunshine days in September - Aspen Hill, MD
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in September
Aspen Hill, MD

Average UV index in September - Aspen Hill, 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, November and December (UV index 2).

Average cloud cover in September
Aspen Hill, MD

Average cloud cover in September - Aspen Hill, MD
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Aspen Hill, MD

Average visibility in September - Aspen Hill, 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).

Aspen Hill, Maryland, USA

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