September weather forecast
Selby-on-the-Bay, MD

Weather in September

September, the first month of the autumn in Selby-on-the-Bay, is still a warm month, with an average temperature ranging between max 77°F (25°C) and min 64.6°F (18.1°C).

Temperature

In Selby-on-the-Bay, the average high-temperature in September slightly decreases from a warm 83.3°F (28.5°C) in August to a still moderately hot 77°F (25°C). The average low-temperature, in Selby-on-the-Bay, is 64.6°F (18.1°C).

Humidity

In September, the average relative humidity in Selby-on-the-Bay is 75%.

Rainfall

In September, the rain falls for 10.5 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 120.4 rainfall days, and 10.47" (266mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Ocean temperature

In Selby-on-the-Bay, Maryland, the average water temperature is 74.1°F (23.4°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 74.1°F (23.4°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The average length of the day in September 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 7:01 am and sunset at 6:50 pm EDT.

Sunshine

In Selby-on-the-Bay, Maryland, the average sunshine in September is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. 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 average humidity in September in Selby-on-the-Bay?

In Selby-on-the-Bay, the average relative humidity in September is 75%.

How many days does it rain in September in Selby-on-the-Bay?

In Selby-on-the-Bay, in September, during 10.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When it does not snow in Selby-on-the-Bay?

April through October are months without snowfall in Selby-on-the-Bay, Maryland.

How warm is the water in September in Selby-on-the-Bay?

In Selby-on-the-Bay, Maryland, in September, the average water temperature is 74.1°F (23.4°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.1°F (23.4°C) water may be enjoyable.

What is the average length of the day in September in Selby-on-the-Bay?

In September, the average day length in Selby-on-the-Bay is 12h and 26min.

When are sunrise and sunset in September in Selby-on-the-Bay?

In September, on the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, in Selby-on-the-Bay, Maryland, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

How long on average sun shines in September in Selby-on-the-Bay?

In September, the average sunshine duration in Selby-on-the-Bay, Maryland, is 9.2h.

How high is the UV index in September in Selby-on-the-Bay?

In Selby-on-the-Bay, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
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
Selby-on-the-Bay, MD

Average temperature in September - Selby-on-the-Bay, MD
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in September
Selby-on-the-Bay, MD

Average pressure in September - Selby-on-the-Bay, 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
Selby-on-the-Bay, MD

Average wind speed in September - Selby-on-the-Bay, MD
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in September
Selby-on-the-Bay, MD

Average humidity in September - Selby-on-the-Bay, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

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Average rainfall in September
Selby-on-the-Bay, MD

Average rainfall in September - Selby-on-the-Bay, MD
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in September
Selby-on-the-Bay, MD

Average rainfall days in September - Selby-on-the-Bay, MD
  • Average rainfall days in September: 10.5 days

The months with the highest number of rainy days are July and August (14.3 days).
The month with the least rainy days is November (5.3 days).

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Average snowfall in September
Selby-on-the-Bay, MD

Average snowfall in September - Selby-on-the-Bay, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.67").
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
Selby-on-the-Bay, MD

Average snowfall days in September - Selby-on-the-Bay, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 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
Selby-on-the-Bay, MD

Average sea temperature in September - Selby-on-the-Bay, MD
  • Average sea temperature in September: 74.2°F

The best month for swimming (with the highest average sea temperature) is August (78°F).
The coldest month (with the lowest average sea temperature) is February (45.9°F).

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Average daylight in September /
Average sunshine in September
Selby-on-the-Bay, MD

Average daylight in September / Average sunshine in September - Selby-on-the-Bay, MD
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 51min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in September: 9h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
Selby-on-the-Bay, MD

Average sunshine days in September - Selby-on-the-Bay, MD
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).

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Average UV index in September
Selby-on-the-Bay, MD

Average UV index in September - Selby-on-the-Bay, 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
Selby-on-the-Bay, MD

Average cloud cover in September - Selby-on-the-Bay, MD
  • Average cloud cover in September: 33

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 28).

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Average visibility in September
Selby-on-the-Bay, MD

Average visibility in September - Selby-on-the-Bay, 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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