September weather forecast
Cabin John, MD

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Weather in September

The first month of the autumn, September, is still a warm month in Cabin John, Maryland, with an average temperature varying between 61.5°F (16.4°C) and 78.4°F (25.8°C).

Temperature

Cabin John's weather subtly changes with the onset of September, barely falling from 85.8°F (29.9°C) in August to a still moderately hot 78.4°F (25.8°C). An average low-temperature of 61.5°F (16.4°C) is anticipated throughout the nights in Cabin John during September.

Humidity

In September, the average relative humidity in Cabin John is 73%.

Rainfall

In Cabin John, during September, the rain falls for 12.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Cabin John, during the entire year, the rain falls for 150.3 days and collects up to 28.66" (728mm) of precipitation.

Snowfall

In Cabin John, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:38 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In Cabin John, 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 exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the UV index of 5 transforms into the following advice:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Frequently asked questions

What is the usual temperature for Cabin John in September?

Cabin John in September has an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 61.5°F (16.4°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 95°F (35°C).

What is the average humidity in September in Cabin John?

In September, the average relative humidity is 73%.

How much does it rain in Cabin John in September?

In Cabin John, in September, it is raining for 12.5 days, with typically 2.05" (52mm) of accumulated precipitation.

When it does not snow in Cabin John?

May through October are months without snowfall.

What is the average length of the day in September in Cabin John?

In Cabin John, Maryland, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Cabin John?

On the first day of September in Cabin John, Maryland, sunrise is at 6:38 am and sunset at 7:38 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 Cabin John?

In Cabin John, Maryland, the average sunshine duration in September is 8.8h.

What is the UV index intensity in September in Cabin John?

The average daily maximum UV index in September in Cabin John, Maryland, is 5. A UV Index estimate of 3 to 5 represents 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
Cabin John, MD

Average temperature in September - Cabin John, MD
  • Average high temperature in September: 78.4°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 (39.9°F).

  • Average low temperature in September: 61.5°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (27°F).

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Average pressure in September
Cabin John, MD

Average pressure in September - Cabin John, 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).

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Average wind speed in September
Cabin John, MD

Average wind speed in September - Cabin John, MD
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in September
Cabin John, MD

Average humidity in September - Cabin John, MD
  • Average humidity in September: 73%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in September
Cabin John, MD

Average rainfall in September - Cabin John, MD
  • Average rainfall in September: 2.05"

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.69").

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Average rainfall days in September
Cabin John, MD

Average rainfall days in September - Cabin John, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (8.5 days).

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Average snowfall in September
Cabin John, MD

Average snowfall in September - Cabin John, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Cabin John, MD

Average snowfall days in September - Cabin John, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Cabin John, MD

Average daylight in September / Average sunshine in September - Cabin John, 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).

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Average sunshine days in September
Cabin John, MD

Average sunshine days in September - Cabin John, MD
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (20.4 days).
The months with the least sunshine days are May and July (12.3 days).

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Average UV index in September
Cabin John, MD

Average UV index in September - Cabin John, 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, November and December (UV index 2).

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Average cloud cover in September
Cabin John, MD

Average cloud cover in September - Cabin John, MD
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Cabin John, MD

Average visibility in September - Cabin John, 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).

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Cabin John, Maryland, USA

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