September weather forecast
Fort Washington, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Fort Washington, Maryland, with an average temperature fluctuating between 61.7°F (16.5°C) and 78.6°F (25.9°C).

Temperature

Start of September brings a slight shift in the average high-temperature, dipping a bit from August's warm 85.6°F (29.8°C) to a still moderately hot 78.6°F (25.9°C). Fort Washington's temperature lowers to a mean of 61.7°F (16.5°C) during the nights in September.

Humidity

In Fort Washington, the average relative humidity in September is 74%.

Rainfall

The month with the least rainfall is September, when the rain falls for 11.9 days and typically collects 1.93" (49mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day in Fort Washington, Maryland, is 12h and 26min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

The average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Stay sun-safe with clothing that is both closely woven and worn loosely.

Frequently asked questions

What are September temperatures?

Fort Washington in September has an average high-temperature of 78.6°F (25.9°C) and an average low-temperature of 61.7°F (16.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is calculated to be 95°F (35°C).

What is the average humidity in September in Fort Washington?

In September, the average relative humidity is 74%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 11.9 days and typically collects 1.93" (49mm) of precipitation.

How much does it rain in September?

In Fort Washington, in September, during 11.9 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

When it does not snow?

In Fort Washington, snow does not fall in May through October.

How many hours of daylight does Fort Washington have in September?

In September, the average day length is 12h and 26min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of the month, 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 9h.

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 moderate health threat 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
Fort Washington, MD

Average temperature in September - Fort Washington, MD
  • Average high temperature in September: 78.6°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in September
Fort Washington, MD

Average pressure in September - Fort Washington, 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
Fort Washington, MD

Average wind speed in September - Fort Washington, MD
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Fort Washington, MD

Average humidity in September - Fort Washington, MD
  • Average humidity in September: 74%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in September
Fort Washington, MD

Average rainfall in September - Fort Washington, MD
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September
Fort Washington, MD

Average rainfall days in September - Fort Washington, MD
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in September
Fort Washington, MD

Average snowfall in September - Fort Washington, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Fort Washington, MD

Average snowfall days in September - Fort Washington, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.5 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
Fort Washington, MD

Average daylight in September / Average sunshine in September - Fort Washington, MD
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 0min

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 6min).

Average sunshine days in September
Fort Washington, MD

Average sunshine days in September - Fort Washington, MD
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in September
Fort Washington, MD

Average UV index in September - Fort Washington, 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 and December (UV index 2).

Average cloud cover in September
Fort Washington, MD

Average cloud cover in September - Fort Washington, MD
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
Fort Washington, MD

Average visibility in September - Fort Washington, 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).

Fort Washington, Maryland, USA

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