September weather forecast
Rockburn Commons, MD

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Weather in September

September, the first month of the autumn in Rockburn Commons, is still a warm month, with an average temperature fluctuating between 77.2°F (25.1°C) and 62.2°F (16.8°C).

Temperature

September implies a soft temperature shift, with average high-temperatures reducing from August's warm 83.8°F (28.8°C) to a still moderately hot 77.2°F (25.1°C). Throughout the month of September, Rockburn Commons observes an average nighttime temperature of 62.2°F (16.8°C).

Humidity

In Rockburn Commons, Maryland, the average relative humidity in September is 75%.

Rainfall

In Rockburn Commons, in September, it is raining for 13.1 days, with typically 2.09" (53mm) of accumulated precipitation. Throughout the year, there are 156.3 rainfall days, and 29.61" (752mm) of precipitation is accumulated.

Snowfall

In Rockburn Commons, snow does not fall in April through October.

Daylight

In September, the average length of the day 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 6:50 pm EDT.

Sunshine

The average sunshine in September is 9.3h.

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 unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 5 during September translates into the following directions:
Prioritize safety - Suggestions to prevent sun damage are offered. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jun 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

During September, Rockburn Commons experiences an average high-temperature of 77.2°F (25.1°C) and a low-temperature of 62.2°F (16.8°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How much does it rain in September?

In Rockburn Commons, in September, during 13.1 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow?

In Rockburn Commons, snow does not fall in April through October.

How many hours of daylight does Rockburn Commons have in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:36 am and sunset at 7:37 pm. On the last day of the month, in Rockburn Commons, Maryland, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.3h.

What is the UV index intensity in September?

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 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
Rockburn Commons, MD

Average temperature in September - Rockburn Commons, MD
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.8°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 (27.3°F).

Average pressure in September
Rockburn Commons, MD

Average pressure in September - Rockburn Commons, 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
Rockburn Commons, MD

Average wind speed in September - Rockburn Commons, MD
  • Average wind speed in September: 6.5mph

The windiest months (with the highest average wind speed) are February and March (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in September
Rockburn Commons, MD

Average humidity in September - Rockburn Commons, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are April and July (72%).

Average rainfall in September
Rockburn Commons, MD

Average rainfall in September - Rockburn Commons, MD
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is January (1.77").

Average rainfall days in September
Rockburn Commons, MD

Average rainfall days in September - Rockburn Commons, MD
  • Average rainfall days in September: 13.1 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in September
Rockburn Commons, MD

Average snowfall in September - Rockburn Commons, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.24").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Rockburn Commons, MD

Average snowfall days in September - Rockburn Commons, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.9 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
Rockburn Commons, MD

Average daylight in September / Average sunshine in September - Rockburn Commons, 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 2min

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 6min).

Average sunshine days in September
Rockburn Commons, MD

Average sunshine days in September - Rockburn Commons, MD
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is July (10.9 days).

Average UV index in September
Rockburn Commons, MD

Average UV index in September - Rockburn Commons, 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, February, November and December (UV index 2).

Average cloud cover in September
Rockburn Commons, MD

Average cloud cover in September - Rockburn Commons, MD
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
Rockburn Commons, MD

Average visibility in September - Rockburn Commons, 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).

Rockburn Commons, Maryland, USA

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