September weather forecast
Dundalk, MD

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Weather in September

September ushers in the onset of Autumn, with temperatures subtly dipping to a comfortable 76.8°F (24.9°C). A noticeable drop in rainfall to 0.24in makes this the driest month of the year in Dundalk. Golden hues begin to dominate the city landscape as leaves start their transformation. In this month, weather changes become more noticeable, with sunny days slowly giving way to cooler, shorter days. Despite the impending chill, residents enjoy a blend of summer’s residual warmth and autumn’s refreshing coolness.

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a moderately hot 82.9°F (28.3°C) in August to a still warm 76.8°F (24.9°C). Dundalk records a mean low-temperature of 62.4°F (16.9°C) in September.

Humidity

In Dundalk, the average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 6 days and accumulates 0.24" (6mm) of precipitation.

Snowfall

In Dundalk, snow does not fall in April through October.

Ocean temperature

In Dundalk, the average seawater temperature in September is 73.6°F (23.1°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73.6°F (23.1°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

The average length of the day in September in Dundalk 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, in Dundalk, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

The average daily maximum UV index in September in Dundalk is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interprets into the following advice:
Act with care - The need to guard against sun damage is communicated. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Heads up! UV intensity is amplified by reflections from water and sand.
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Frequently asked questions

What is the average September temperature in Dundalk?

September temperatures vary between a high-temperature of 76.8°F (24.9°C) and a low-temperature of 62.4°F (16.9°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 calculated to be 89.6°F (32°C).

What is the average humidity in September in Dundalk?

In Dundalk, Maryland, the average relative humidity in September is 75%.

What is the driest month in Dundalk?

September is the month with the least rainfall. Rain falls for 6 days and accumulates 0.24" (6mm) of precipitation.

How much does it rain in Dundalk in September?

In Dundalk, Maryland, during September, the rain falls for 6 days and regularly aggregates up to 0.24" (6mm) of precipitation.

When it does not snow in Dundalk?

In Dundalk, Maryland, snow does not fall in April through October.

What is the ocean temperature in September in Dundalk?

In September, the average ocean temperature is 73.6°F (23.1°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73.6°F (23.1°C) water.

How many hours of daylight does Dundalk have in September?

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

When are sunrise and sunset in September in Dundalk?

On the first day of September in Dundalk, Maryland, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

How long on average sun shines in September in Dundalk?

The average sunshine duration in September is 9.2h.

How high is the UV index in September in Dundalk?

In September, the average daily maximum UV index is 5. A UV Index reading 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
Dundalk, MD

Average temperature in September - Dundalk, MD
  • Average high temperature in September: 76.8°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 62.4°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

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Average pressure in September
Dundalk, MD

Average pressure in September - Dundalk, 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).

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Average wind speed in September
Dundalk, MD

Average wind speed in September - Dundalk, MD
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity in September
Dundalk, MD

Average humidity in September - Dundalk, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Dundalk, MD

Average rainfall in September - Dundalk, MD
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is August (1.06").
The driest month (with the least rainfall) is September (0.24").

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Average rainfall days in September
Dundalk, MD

Average rainfall days in September - Dundalk, MD
  • Average rainfall days in September: 6 days

The month with the highest number of rainy days is July (10.3 days).
The month with the least rainy days is November (4.1 days).

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Average snowfall in September
Dundalk, MD

Average snowfall in September - Dundalk, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Dundalk, MD

Average snowfall days in September - Dundalk, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Dundalk, MD

Average sea temperature in September - Dundalk, MD
  • Average sea temperature in September: 73.5°F

The best month for swimming (with the highest average sea temperature) is August (77.5°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).

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Average daylight in September /
Average sunshine in September
Dundalk, MD

Average daylight in September / Average sunshine in September - Dundalk, 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
Dundalk, MD

Average sunshine days in September - Dundalk, MD
  • Average sunshine days in September: 21.5 days

The month with the most sunshine days is January (24.7 days).
The month with the least sunshine days is July (16.9 days).

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Average UV index in September
Dundalk, MD

Average UV index in September - Dundalk, 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).

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Average cloud cover in September
Dundalk, MD

Average cloud cover in September - Dundalk, MD
  • Average cloud cover in September: 34

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 29).

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Average visibility in September
Dundalk, MD

Average visibility in September - Dundalk, 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).

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Dundalk, Maryland, USA

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