September weather forecast
Vieux Fort, Saint Lucia

englishespañol中文
Share

Weather in September

September is the hottest month in Vieux Fort, with temperatures climbing to 29.5°C. Likewise, historically, Saint Lucia residents face significant showers of about 64mm. Simultaneously, the sea temperatures start to decrease but remain warm for swimming and other water activities. Meanwhile, daylight hours become shorter, signaling the end of the longer summer days. Despite the rain, Vieux Fort remains a beautiful tropical paradise, brands summer's end with a mix of warmth, sun, and refreshing rain.

Temperature

Vieux Fort's temperature peaks during September and October, with an average high-temperature of 29.5°C.

Heat index

Throughout September, the heat index is calculated to be a fiery hot 35°C. Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Heat index values are typically calculated for conditions of shade and a light breeze. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, the rain falls for 19.5 days. Throughout September, 64mm of precipitation is accumulated. Throughout the year, in Vieux Fort, Saint Lucia, there are 232.4 rainfall days, and 542mm of precipitation is accumulated.

Sea temperature

With an average sea temperature of 29.6°C, September is the month with the warmest seawater in Vieux Fort.
Note: For water activities like swimming, diving, and more, temperatures ranging between 25°C and 29°C offer superior comfort and enjoyment for lengthy durations.

Daylight

In Vieux Fort, the average length of the day in September is 12h and 12min.
On the first day of September, sunrise is at 05:52 and sunset at 18:15. On the last day of the month, sunrise is at 05:53 and sunset at 17:54 AST.

Sunshine

The average sunshine in September is 10.1h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Vieux Fort. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum daily UV index of 7 during September morphs into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
[Resources]

FAQ

What are the warmest months in Vieux Fort?

Vieux Fort sees the average highest temperatures during the months of September and October, peaking at 29.5°C.

How hot is it in Vieux Fort in September?

An average high-temperature, in September, in Vieux Fort, is 29.5°C and the average low-temperature is 27.6°C. In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is calculated to be 35°C.

What is the average humidity in September in Vieux Fort?

In September, the average relative humidity in Vieux Fort, Saint Lucia, is 75%.

How much does it rain in Vieux Fort in September?

In September, the rain falls for 19.5 days. Throughout September, 64mm of precipitation is accumulated.

What month is the sea warmest in Vieux Fort?

The month with the warmest seawater in Vieux Fort, Saint Lucia, is September, with an average sea temperature of 29.6°C.

What is the water temperature in September in Vieux Fort?

In Vieux Fort, the average seawater temperature in September is 29.6°C. Water temperature between 25°C and 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 Vieux Fort?

In September, the average day length in Vieux Fort, Saint Lucia, is 12h and 12min.

When is the sunrise / sunset in September in Vieux Fort?

In September, on the first day of the month, sunrise is at 05:52 and sunset at 18:15. On the last day of the month, in Vieux Fort, sunrise is at 05:53 and sunset at 17:54 AST.

How many hours of sunshine does Vieux Fort have in September?

In Vieux Fort, the average sunshine duration in September is 10.1h.

What is the month with the highest UV index in Vieux Fort?

January through December, with an average maximum UV index of 7, are months with the highest UV index in Vieux Fort, Saint Lucia.

What are the months with the lowest UV index in Vieux Fort?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Vieux Fort.

What is the UV index intensity in September in Vieux Fort?

In September, the average daily maximum UV index in Vieux Fort, Saint Lucia, is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Vieux Fort, Saint Lucia

Average temperature in September - Vieux Fort, Saint Lucia
  • Average high temperature in September: 29.5°C

The warmest months (with the highest average high temperature) are September and October (29.5°C).
The month with the lowest average high temperature is February (26.8°C).

  • Average low temperature in September: 27.6°C

The month with the highest average low temperature is September (27.6°C).
The coldest month (with the lowest average low temperature) is February (25.3°C).

[Resources]

Average pressure in September
Vieux Fort, Saint Lucia

Average pressure in September - Vieux Fort, Saint Lucia
  • Average pressure in September: 1012.5mbar

The month with the highest atmospheric pressure is June (1014.9mbar).
The month with the lowest atmospheric pressure is November (1011.3mbar).

[Resources]

Average wind speed in September
Vieux Fort, Saint Lucia

Average wind speed in September - Vieux Fort, Saint Lucia
  • Average wind speed in September: 18.3km/h

The windiest month (with the highest average wind speed) is February (26.9km/h).
The calmest month (with the lowest average wind speed) is September (18.3km/h).

[Resources]

Average humidity in September
Vieux Fort, Saint Lucia

Average humidity in September - Vieux Fort, Saint Lucia
  • Average humidity in September: 75%

The month with the highest relative humidity is July (77%).
The months with the lowest relative humidity are January and February (74%).

[Resources]

Average rainfall in September
Vieux Fort, Saint Lucia

Average rainfall in September - Vieux Fort, Saint Lucia
  • Average rainfall in September: 64mm

The wettest month (with the highest rainfall) is October (73mm).
The driest month (with the least rainfall) is February (18mm).

[Resources]

Average rainfall days in September
Vieux Fort, Saint Lucia

Average rainfall days in September - Vieux Fort, Saint Lucia
  • Average rainfall days in September: 19.5 days

The month with the highest number of rainy days is July (23.3 days).
The month with the least rainy days is February (15 days).

[Resources]

Average sea temperature in September
Vieux Fort, Saint Lucia

Average sea temperature in September - Vieux Fort, Saint Lucia
  • Average sea temperature in September: 29.6°C

The best month for swimming (with the highest average sea temperature) is September (29.6°C).
The coldest months (with the lowest average sea temperature) are February and March (27.2°C).

[Resources]

Average daylight in September /
Average sunshine in September
Vieux Fort, Saint Lucia

Average daylight in September / Average sunshine in September - Vieux Fort, Saint Lucia
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

[Resources]

Average sunshine days in September
Vieux Fort, Saint Lucia

Average sunshine days in September - Vieux Fort, Saint Lucia
  • Average sunshine days in September: 7.1 days

The month with the most sunshine days is March (9.1 days).
The month with the least sunshine days is July (3.6 days).

[Resources]

Average UV index in September
Vieux Fort, Saint Lucia

Average UV index in September - Vieux Fort, Saint Lucia
  • Average UV index in September: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

[Resources]

Average cloud cover in September
Vieux Fort, Saint Lucia

Average cloud cover in September - Vieux Fort, Saint Lucia
  • Average cloud cover in September: 37

The month with the most cloud cover is June (Cloud cover 46).
The month with the least cloud cover is February (Cloud cover 35).

[Resources]

Average visibility in September
Vieux Fort, Saint Lucia

Average visibility in September - Vieux Fort, Saint Lucia
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

[Resources]

Vieux Fort, Saint Lucia

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location