September weather forecast
Merryman Heights, MD

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Weather in September

September, the first month of the autumn in Merryman Heights, is also a moderately hot month, with an average temperature ranging between max 75.9°F (24.4°C) and min 59°F (15°C).

Temperature

With the commencement of September, Merryman Heights records a moderate temperature decline, with the average high easing from August's moderately hot 82.6°F (28.1°C) to a still warm 75.9°F (24.4°C). In Merryman Heights, an average temperature of 59°F (15°C) is noted during September nights.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Merryman Heights, in September, it is raining for 13.9 days, with typically 2.28" (58mm) of accumulated precipitation. Throughout the year, there are 159 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall.

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 7:38 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

In Merryman Heights, the average sunshine in September is 8.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.

Frequently asked questions

What are September temperatures?

The average high-temperature and low-temperature during September are 75.9°F (24.4°C) and 59°F (15°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 89.6°F (32°C).

What is the average humidity in September?

In Merryman Heights, the average relative humidity in September is 77%.

How many days does it rain in September?

In September, the rain falls for 13.9 days. Throughout September, 2.28" (58mm) of precipitation is accumulated.

When it does not snow?

June through October are months without snowfall.

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

In September, the average day length 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 7:38 pm. On the last day of the month, in Merryman Heights, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index reading 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
Merryman Heights, MD

Average temperature in September - Merryman Heights, MD
  • Average high temperature in September: 75.9°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 (37.6°F).

  • Average low temperature in September: 59°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in September
Merryman Heights, MD

Average pressure in September - Merryman Heights, MD
  • Average pressure in September: 30.06"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
Merryman Heights, MD

Average wind speed in September - Merryman Heights, MD
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in September
Merryman Heights, MD

Average humidity in September - Merryman Heights, MD
  • Average humidity in September: 77%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in September
Merryman Heights, MD

Average rainfall in September - Merryman Heights, MD
  • Average rainfall in September: 2.28"

The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is February (1.97").

Average rainfall days in September
Merryman Heights, MD

Average rainfall days in September - Merryman Heights, MD
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in September
Merryman Heights, MD

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

The month with the highest snowfall is March (2.8").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Merryman Heights, MD

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

The month with the highest number of snowfall days is January (5.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Merryman Heights, 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 24min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).

Average sunshine days in September
Merryman Heights, MD

Average sunshine days in September - Merryman Heights, MD
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (11.2 days).

Average UV index in September
Merryman Heights, MD

Average UV index in September - Merryman Heights, MD
  • Average UV index in September: 4

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
Merryman Heights, MD

Average cloud cover in September - Merryman Heights, MD
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Merryman Heights, MD

Average visibility in September - Merryman 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).

Merryman Heights, Maryland, USA

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