September weather forecast
Baltimore, MD

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

Weather in September

September brings about a significant seasonal shift in Baltimore as it transitions from the Summer's heat to the cooler temperatures of Autumn. The humidity is less oppressive, and a touch of Fall is palpable in the cool mornings and evenings. Temperatures drop to a comfortable range with a high of 77°F (25°C). Rainfall decreases, marking the arrival of Fall and the departure of the peak summer months. It is a beautiful time to be in Baltimore with leaves changing color and favorable conditions for outdoor exploration.

Temperature

A subtle shift in Baltimore's weather is observed as August turns into September, with the average high temperature reducing from 83.5°F (28.6°C) to a still moderately hot 77°F (25°C). In the month of September, the temperature in Baltimore generally rests at an average low of 61.3°F (16.3°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 13.2 days. Throughout September, 2.24" (57mm) of precipitation is 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, Maryland, snow does not fall in April through October.

Ocean temperature

In September, the average ocean temperature is 73.6°F (23.1°C).
Note: Factor in your tolerance to cold, the sunshine, the wind, and the air's warmth, and a swim in 73.6°F (23.1°C) might be tempting. It is interesting to note that Olympians compete in 77°F (25°C) to 82.4°F (28°C) water temperatures.

Daylight

The average length of the day in September in Baltimore, Maryland, is 12h and 26min.
On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

Sunshine

In Baltimore, Maryland, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Warning! The reflection of sand and water increases the UV dose.
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Frequently asked questions

What is the temperature in September in Baltimore?

The average high-temperature and low-temperature in Baltimore, Maryland, during September are 77°F (25°C) and 61.3°F (16.3°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is estimated at 89.6°F (32°C).

What is the average humidity in September in Baltimore?

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

How much does it rain in Baltimore in September?

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

When it does not snow in Baltimore?

April through October are months without snowfall in Baltimore.

How warm is the water in September in Baltimore?

In Baltimore, Maryland, in September, the average water temperature is 73.6°F (23.1°C). 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.

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

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

What time are sunrise and sunset in September in Baltimore?

On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

How long on average sun shines in September in Baltimore?

The average sunshine duration in September in Baltimore, Maryland, is 9.2h.

What is the UV index reading 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 moderate health threat from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
83.5°F 28.6°C
77°F 25°C
65.3°F 18.5°C
Average low temperature
67.8°F 19.9°C
61.3°F 16.3°C
51.4°F 10.8°C
Average pressure
29.99" 762mmHg
30.05" 763mmHg
30.04" 763mmHg
Average wind speed
5.7mph 9.2km/h
6.5mph 10.5km/h
7.8mph 12.6km/h
Average max. wind speed
6.2mph 10km/h
6.6mph 10.6km/h
8.4mph 13.5km/h
Average wind speed gusts
8.7mph 14km/h
9.9mph 15.9km/h
12.4mph 20km/h
Average humidity
73%
75%
75%
Average rainfall
4.13" 105mm
2.24" 57mm
2.2" 56mm
Average rainfall days
16.8
13.2
12.4
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
77.5°F 25.3°C
73.5°F 23.1°C
66.1°F 18.9°C
Average daylight
13h 4min
12h 2min
11h 1min
Average sunshine
10h 2min
9h 1min
5h 4min
Average sunshine days
12.1
14.6
16.5
Average UV index
6
5
4
Average cloud cover
31%
34%
38%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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 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
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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Baltimore, Maryland, USA

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