September weather forecast
Old Germantown, MD

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Weather in September

September, the first month of the autumn in Old Germantown, is still a warm month, with an average temperature varying between 59.2°F (15.1°C) and 77.5°F (25.3°C).

Temperature

The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 84.6°F (29.2°C) to a still warm 77.5°F (25.3°C). During September, Old Germantown records an average temperature of 59.2°F (15.1°C) at night.

Humidity

In Old Germantown, the average relative humidity in September is 76%.

Rainfall

In Old Germantown, in September, during 14.2 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Old Germantown, during the entire year, the rain falls for 159.4 days and collects up to 30.71" (780mm) of precipitation.

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 the month, sunrise is at 6:38 am and sunset at 7:39 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 9h.

UV index

In Old Germantown, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, a regular UV index of 5 translates into these guidelines:
Be vigilant - Preventing sunburn is recommended. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.

Frequently asked questions

What is the usual temperature for Old Germantown in September?

In Old Germantown, in September, the average high-temperature is 77.5°F (25.3°C), and the average low-temperature is 59.2°F (15.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is estimated at 93.2°F (34°C).

What is the average humidity in September?

In Old Germantown, the average relative humidity in September is 76%.

How many days does it rain in September?

In Old Germantown, Maryland, in September, during 14.2 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

When it does not snow?

June through October are months without snowfall.

How many hours of daylight does Old Germantown have in September?

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

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How long on average sun shines in September?

In Old Germantown, Maryland, the average sunshine duration in September is 9h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
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
Old Germantown, MD

Average temperature in September - Old Germantown, MD
  • Average high temperature in September: 77.5°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 59.2°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in September
Old Germantown, MD

Average pressure in September - Old Germantown, 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 (29.95"Hg).

Average wind speed in September
Old Germantown, MD

Average wind speed in September - Old Germantown, MD
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in September
Old Germantown, MD

Average humidity in September - Old Germantown, MD
  • Average humidity in September: 76%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (72%).

Average rainfall in September
Old Germantown, MD

Average rainfall in September - Old Germantown, MD
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is August (3.78").
The driest months (with the least rainfall) are January and February (1.97").

Average rainfall days in September
Old Germantown, MD

Average rainfall days in September - Old Germantown, MD
  • Average rainfall days in September: 14.2 days

The month with the highest number of rainy days is May (17.5 days).
The months with the least rainy days are January and November (9.5 days).

Average snowfall in September
Old Germantown, MD

Average snowfall in September - Old Germantown, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.83").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Old Germantown, MD

Average snowfall days in September - Old Germantown, MD
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (5.8 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
Old Germantown, MD

Average daylight in September / Average sunshine in September - Old Germantown, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).

Average sunshine days in September
Old Germantown, MD

Average sunshine days in September - Old Germantown, MD
  • Average sunshine days in September: 14.1 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in September
Old Germantown, MD

Average UV index in September - Old Germantown, 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
Old Germantown, MD

Average cloud cover in September - Old Germantown, MD
  • Average cloud cover in September: 37

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
Old Germantown, MD

Average visibility in September - Old Germantown, 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).

Old Germantown, Maryland, USA

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