September weather forecast and climate
Dauphin Island, AL

The scenic Dauphin Island in Alabama
The scenic Dauphin Island in Alabama

Weather in September

The first month of the autumn, September, is still a warm month in Dauphin Island, Alabama, with average temperature fluctuating between 75°F (23.9°C) and 85.5°F (29.7°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a warm 85.5°F (29.7°C). In Dauphin Island, the average low-temperature is 75°F (23.9°C).

Heat index

In September, the average heat index is estimated at a very hot 95.4°F (35.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like wind, differences in body mass, height, and shape, clothing, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In September, the rain falls for 19.1 days. Throughout September, 4.57" (116mm) of precipitation is accumulated. Throughout the year, in Dauphin Island, there are 183.1 rainfall days, and 45.94" (1167mm) of precipitation is accumulated.

Snowfall

In Dauphin Island snow does not fall in February through December.

Ocean temperature

In September, the average ocean temperature is 83.1°F (28.4°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Dauphin Island, Alabama, the average length of the day in September is 12.3h.

Sunshine

In Dauphin Island, the average sunshine in September is 9.9h.

UV index

In Dauphin Island, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the temperature in September in Dauphin Island?

In September, in Dauphin Island, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 75°F (23.9°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that takes the relative humidity and factores it into the air temperature reading, in September is evaluated at 95.4°F (35.2°C).

What is the average humidity in September in Dauphin Island?

In September, the average relative humidity in Dauphin Island is 74%.

How much does it rain in Dauphin Island in September?

In September, the rain falls for 19.1 days. Throughout September, 4.57" (116mm) of precipitation is accumulated.

When it does not snow in Dauphin Island?

February through December are months without snowfall in Dauphin Island.

What is the water temperature in September in Dauphin Island?

In September, the average ocean temperature in Dauphin Island is 83.1°F (28.4°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Dauphin Island?

In September, the average length of the day in Dauphin Island, Alabama, is 12.3h.

How many hours of sunshine does Dauphin Island have in September?

In Dauphin Island, the average sunshine in September is 9.9h.

What is the UV index intensity in September in Dauphin Island?

In Dauphin Island, Alabama, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Dauphin Island, AL

Average temperature in September - Dauphin Island, AL
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (59°F).

  • Average low temperature in September: 75°F

The month with the highest average low temperature is August (78.8°F).
The coldest month (with the lowest average low temperature) is January (47.3°F).

[Resources]

Average pressure in September
Dauphin Island, AL

Average pressure in September - Dauphin Island, AL
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is January (30.16").
Months with the lowest atmospheric pressure are June and August (29.97").

[Resources]

Average wind speed in September
Dauphin Island, AL

Average wind speed in September - Dauphin Island, AL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).

[Resources]

Average humidity in September
Dauphin Island, AL

Average humidity in September - Dauphin Island, AL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (70%).

[Resources]

Average rainfall in September
Dauphin Island, AL

Average rainfall in September - Dauphin Island, AL
  • Average rainfall in September: 4.57"

The wettest month (with the highest rainfall) is August (6.89").
The driest month (with the least rainfall) is November (2.28").

[Resources]

Average rainfall days in September
Dauphin Island, AL

Average rainfall days in September - Dauphin Island, AL
  • Average rainfall days in September: 19.1 days

The month with the highest number of rainy days is July (25.3 days).
The month with the least rainy days is November (8.4 days).

[Resources]

Average snowfall in September
Dauphin Island, AL

Average snowfall in September - Dauphin Island, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.12").
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

[Resources]

Average snowfall days in September
Dauphin Island, AL

Average snowfall days in September - Dauphin Island, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

[Resources]

Average sea temperature in September
Dauphin Island, AL

Average sea temperature in September - Dauphin Island, AL
  • Average sea temperature in September: 83.1°F

The best month for swimming (with the highest average sea temperature) is August (86.6°F).
The coldest month (with the lowest average sea temperature) is January (58.7°F).

[Resources]

Average daylight in September /
Average sunshine in September
Dauphin Island, AL

Average daylight in September / Average sunshine in September - Dauphin Island, AL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is June (Average sunshine: 11.2h).
Months with the least sunshine are February and December (Average sunshine: 5.5).

[Resources]

Average sunshine days in September
Dauphin Island, AL

Average sunshine days in September - Dauphin Island, AL
  • Average sunshine days in September: 8.5 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (3.9 days).

[Resources]

Average UV index in September
Dauphin Island, AL

Average UV index in September - Dauphin Island, AL
  • Average UV index in September: 6

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 4).

[Resources]

Average cloud cover in September
Dauphin Island, AL

Average cloud cover in September - Dauphin Island, AL
  • Average cloud cover in September: 23

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 22).

[Resources]

Average visibility in September
Dauphin Island, AL

Average visibility in September - Dauphin Island, AL
  • 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).

[Resources]