September weather forecast and climate
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

The first month of the autumn, September, is also a moderately hot month in Baltimore, Maryland, with average temperature ranging between min 61.3°F (16.3°C) and max 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, is 61.3°F (16.3°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Baltimore, Maryland, during September, the rain falls for 13.2 days and regularly aggregates up to 2.24" (57mm) of precipitation. Throughout the year, in Baltimore, there are 158.5 rainfall days, and 30.75" (781mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In Baltimore, Maryland, 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, Maryland, the average length of the day in September is 12.4h.

Sunshine

In Baltimore, the average sunshine is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 temperature in September in Baltimore?

In Baltimore, in September, the average high-temperature is 77°F (25°C), and the average low-temperature is 61.3°F (16.3°C).

What is the average humidity in September in Baltimore?

In September, the average relative humidity is 75%.

How much does it rain in Baltimore in September?

In Baltimore, Maryland, during September, the rain falls for 13.2 days and regularly aggregates up to 2.24" (57mm) of precipitation.

When it does not snow in Baltimore?

In Baltimore snow does not fall in April through October.

What is the water temperature in September in Baltimore?

In Baltimore, in September, the average water 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 Baltimore have in September?

In September, the average length of the day is 12.4h.

How long on average sun shines in September in Baltimore?

The average sunshine in September in Baltimore is 9.2h.

How high is the UV index in September in Baltimore?

In September, the average daily maximum UV index in Baltimore is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

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"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.94").

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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%).
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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.9h).
The month with the least sunshine is February (Average sunshine: 5h).

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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

Months with the highest UV index are May, June, July and August (UV index 6).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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