September weather forecast
Harkness Creek Park, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Harkness Creek Park, Maryland, with temperature in the range of an average high of 77°F (25°C) and an average low of 64.6°F (18.1°C).

Temperature

The onset of September brings a small shift in high-temperatures, falling from 83.3°F (28.5°C) in August to a still moderately hot 77°F (25°C). In the month of September, the temperature generally rests at an average low of 64.6°F (18.1°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Harkness Creek Park, Maryland, during September, the rain falls for 10.5 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, there are 120.4 rainfall days, and 10.47" (266mm) of precipitation is accumulated.

Snowfall

In Harkness Creek Park, Maryland, snow does not fall in April through October.

Daylight

In September, the average length of the day in Harkness Creek Park is 12h and 26min.
On the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Harkness Creek Park, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in Harkness Creek Park, is 77°F (25°C), while the low-temperature averages to 64.6°F (18.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How many days does it rain in September?

In Harkness Creek Park, in September, during 10.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When it does not snow?

In Harkness Creek Park, snow does not fall in April through October.

What is the average length of the day in September?

In September, the average day length in Harkness Creek Park is 12h and 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, in Harkness Creek Park, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

How many hours of sunshine does Harkness Creek Park have in September?

In September, the average sunshine duration in Harkness Creek Park, Maryland, is 9.2h.

What is the UV index intensity in September?

In Harkness Creek Park, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Harkness Creek Park, MD

Average temperature in September - Harkness Creek Park, MD
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

Average pressure in September
Harkness Creek Park, MD

Average pressure in September - Harkness Creek Park, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Harkness Creek Park, MD

Average wind speed in September - Harkness Creek Park, MD
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in September
Harkness Creek Park, MD

Average humidity in September - Harkness Creek Park, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in September
Harkness Creek Park, MD

Average rainfall in September - Harkness Creek Park, MD
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in September
Harkness Creek Park, MD

Average rainfall days in September - Harkness Creek Park, MD
  • Average rainfall days in September: 10.5 days

The months with the highest number of rainy days are July and August (14.3 days).
The month with the least rainy days is November (5.3 days).

Average snowfall in September
Harkness Creek Park, MD

Average snowfall in September - Harkness Creek Park, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Harkness Creek Park, MD

Average snowfall days in September - Harkness Creek Park, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 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
Harkness Creek Park, MD

Average daylight in September / Average sunshine in September - Harkness Creek Park, 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 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Harkness Creek Park, MD

Average sunshine days in September - Harkness Creek Park, MD
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).

Average UV index in September
Harkness Creek Park, MD

Average UV index in September - Harkness Creek Park, 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 and December (UV index 2).

Average cloud cover in September
Harkness Creek Park, MD

Average cloud cover in September - Harkness Creek Park, MD
  • Average cloud cover in September: 33

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Harkness Creek Park, MD

Average visibility in September - Harkness Creek Park, 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).

Harkness Creek Park, Maryland, USA

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