September weather forecast
Baltimore, MD

A golden evening appearance of tall buildings in Baltimore, Maryland
A golden evening appearance of tall buildings in Baltimore, Maryland

Weather in September

September, the first month of the autumn in Baltimore, is still a warm month, with an average temperature fluctuating between 61.3°F (16.3°C) and 77°F (25°C).

Temperature

In September, the average high-temperature slightly decreases from 83.5°F (28.6°C) in August to a still warm 77°F (25°C). The average low-temperature, in September, is 61.3°F (16.3°C).

Humidity

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

Rainfall

In Baltimore, Maryland, during 13.2 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Baltimore, during the entire year, the rain falls for 158.5 days and collects up to 30.75" (781mm) of precipitation.

Snowfall

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

Ocean temperature

In Baltimore, Maryland, in September, the average water temperature is 73.6°F (23.1°C).
Note: 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. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In Baltimore, the average length of the day in September is 12h and 26min.
On the first day of September in Baltimore, Maryland, sunrise is at 6:35 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Baltimore?

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

How much does it rain in Baltimore in September?

In Baltimore, Maryland, in September, during 13.2 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

When it does not snow in Baltimore?

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

How warm is the water in September in Baltimore?

In Baltimore, in September, the average water temperature is 73.6°F (23.1°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 73.6°F (23.1°C).

What is the average length of the day in September in Baltimore?

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

When are sunrise and sunset in September in Baltimore?

In September, on the first day of the month, sunrise is at 6:35 am and sunset at 7:37 pm. On the last day of the month, in Baltimore, Maryland, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

How many hours of sunshine does Baltimore have in September?

In September, the average sunshine duration is 9.2h.

How high is the UV index in September in Baltimore?

In Baltimore, Maryland, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Baltimore, MD

Average temperature in September - Baltimore, MD
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.5°F).

  • Average low temperature in September: 61.3°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).

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Average pressure in September
Baltimore, MD

Average pressure in September - Baltimore, 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 (29.94"Hg).

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Average wind speed in September
Baltimore, MD

Average wind speed in September - Baltimore, MD
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in September
Baltimore, MD

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

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are April, July and November (72%).

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Average rainfall in September
Baltimore, MD

Average rainfall in September - Baltimore, MD
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in September
Baltimore, MD

Average rainfall days in September - Baltimore, MD
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is November (8.4 days).

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Average snowfall in September
Baltimore, MD

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

The month with the highest snowfall is January (2.09").
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
Baltimore, MD

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

The month with the highest number of snowfall days is January (4.2 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
Baltimore, MD

Average sea temperature in September - Baltimore, 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
Baltimore, MD

Average daylight in September / Average sunshine in September - Baltimore, MD
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 53min).
The month with the shortest days is December (Average daylight: 9h and 28min).

  • Average sunshine in September: 9h and 12min

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
Baltimore, MD

Average sunshine days in September - Baltimore, MD
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (10.3 days).

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Average UV index in September
Baltimore, MD

Average UV index in September - Baltimore, 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).

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Average cloud cover in September
Baltimore, MD

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

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in September
Baltimore, MD

Average visibility in September - Baltimore, 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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