September weather forecast
Aspen Knolls, MD

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Weather in September

September, the first month of the autumn in Aspen Knolls, is also a moderately hot month, with temperature in the range of an average high of 78.1°F (25.6°C) and an average low of 60.8°F (16°C).

Temperature

In September, the average high-temperature marginally decreases from 84.9°F (29.4°C) in August to a still moderately hot 78.1°F (25.6°C). Aspen Knolls registers a consistent average low-temperature of 60.8°F (16°C) during September.

Humidity

In Aspen Knolls, the average relative humidity in September is 74%.

Rainfall

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

Snowfall

In Aspen Knolls, snow does not fall in May through October.

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

In September, the average sunshine is 8.9h.

UV index

In Aspen Knolls, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Be vigilant - Suggestions to stave off sun damage are provided. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.

Frequently asked questions

What is the average September temperature?

September temperatures in Aspen Knolls vary between a high-temperature of 78.1°F (25.6°C) and a low-temperature of 60.8°F (16°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is evaluated at 93.2°F (34°C).

What is the average humidity in September?

In Aspen Knolls, the average relative humidity in September is 74%.

How many days does it rain in September?

In Aspen Knolls, in September, it is raining for 12.5 days, with typically 2.24" (57mm) of accumulated precipitation.

When it does not snow in Aspen Knolls?

May through October are months without snowfall in Aspen Knolls.

How many hours of daylight does Aspen Knolls have in September?

The average day length in September in Aspen Knolls 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, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How many hours of sunshine does Aspen Knolls have in September?

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

How high is the UV index in September?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Aspen Knolls, MD

Average temperature in September - Aspen Knolls, 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 Knolls, MD

Average pressure in September - Aspen Knolls, 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 Knolls, MD

Average wind speed in September - Aspen Knolls, 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 Knolls, MD

Average humidity in September - Aspen Knolls, 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 Knolls, MD

Average rainfall in September - Aspen Knolls, 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 Knolls, MD

Average rainfall days in September - Aspen Knolls, 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 Knolls, MD

Average snowfall in September - Aspen Knolls, 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 Knolls, MD

Average snowfall days in September - Aspen Knolls, 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 Knolls, MD

Average daylight in September / Average sunshine in September - Aspen Knolls, 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 Knolls, MD

Average sunshine days in September - Aspen Knolls, 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 Knolls, MD

Average UV index in September - Aspen Knolls, 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 Knolls, MD

Average cloud cover in September - Aspen Knolls, 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 Knolls, MD

Average visibility in September - Aspen Knolls, 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 Knolls, Maryland, USA

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