September weather forecast and climate
Marigot Bay, Saint Lucia

Weather in September

September, the first month of the autumn, in Marigot Bay, is a hot month, with temperature in the range of an average low of 27°C (80.6°F) and an average high of 30.3°C (86.5°F).

Temperature

With an average high-temperature of 30.3°C (86.5°F) and an average low-temperature of 27°C (80.6°F), September is the warmest month.

Heat index

In September, the average heat index is calculated to a sweltering 36.6°C (97.9°F). 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 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, clothing, wind), and activity. 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 particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

January through March and September, with an average relative humidity of 73%, are the least humid months.

Rainfall

In September, the rain falls for 20.3 days. Throughout September, 63mm (2.48") of precipitation is accumulated. Throughout the year, in Marigot Bay, there are 255.2 rainfall days, and 560mm (22.05") of precipitation is accumulated.

Sea temperature

September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day is 12.2h.

Sunshine

The average sunshine in Marigot Bay is 9.6h.

UV index

January through May, July through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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 warmest month in Marigot Bay?

September is the warmest month in Marigot Bay, Saint Lucia, with an average high-temperature of 30.3°C (86.5°F) and an average low-temperature of 27°C (80.6°F).

What is the temperature in September in Marigot Bay?

In September, the average high-temperature is 30.3°C (86.5°F), and the average low-temperature is 27°C (80.6°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines air temperature and relative humidity, is calculated to 36.6°C (97.9°F).

What is the least humid month in Marigot Bay?

January through March and September, with an average relative humidity of 73%, are the least humid months in Marigot Bay, Saint Lucia.

What is the average humidity in September in Marigot Bay?

In September, the average relative humidity is 73%.

How many days does it rain in September in Marigot Bay?

In September, in Marigot Bay, Saint Lucia, the rain falls for 20.3 days. Throughout September, 63mm (2.48") of precipitation is accumulated.

What months are the sea warmest in Marigot Bay?

September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.

How warm is the water in September in Marigot Bay?

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

How many hours of daylight does Marigot Bay have in September?

The average length of the day in September in Marigot Bay, Saint Lucia, is 12.2h.

How many hours of sunshine does Marigot Bay have in September?

In Marigot Bay, the average sunshine in September is 9.6h.

What are the months with the highest UV index in Marigot Bay?

January through May, July through December, with an average maximum UV index of 7, are months with the highest UV index in Marigot Bay, Saint Lucia.

What is the UV index intensity in September in Marigot Bay?

In September, the average daily maximum UV index in Marigot Bay, Saint Lucia, is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.

Average temperature in September
Marigot Bay, Saint Lucia

Average temperature in September - Marigot Bay, Saint Lucia
  • Average high temperature in September: 30.3°C

The warmest month (with the highest average high temperature) is September (30.3°C).
Months with the lowest average high temperature are January and February (27.5°C).

  • Average low temperature in September: 27°C

The month with the highest average low temperature is October (27.2°C).
The coldest month (with the lowest average low temperature) is March (25°C).

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Average pressure in September
Marigot Bay, Saint Lucia

Average pressure in September - Marigot Bay, Saint Lucia
  • Average pressure in September: 1012.6mbar

The month with the highest atmospheric pressure is June (1015mbar).
The month with the lowest atmospheric pressure is November (1011.4mbar).

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Average wind speed in September
Marigot Bay, Saint Lucia

Average wind speed in September - Marigot Bay, Saint Lucia
  • Average wind speed in September: 16.7km/h

The windiest month (with the highest average wind speed) is February (24.7km/h).
The calmest month (with the lowest average wind speed) is September (16.7km/h).

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Average humidity in September
Marigot Bay, Saint Lucia

Average humidity in September - Marigot Bay, Saint Lucia
  • Average humidity in September: 73%

Months with the highest relative humidity are May, June, July, August and November (75%).
Months with the lowest relative humidity are January, February, March and September (73%).

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Average rainfall in September
Marigot Bay, Saint Lucia

Average rainfall in September - Marigot Bay, Saint Lucia
  • Average rainfall in September: 63mm

The wettest month (with the highest rainfall) is August (82mm).
The driest month (with the least rainfall) is February (19mm).

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Average rainfall days in September
Marigot Bay, Saint Lucia

Average rainfall days in September - Marigot Bay, Saint Lucia
  • Average rainfall days in September: 20.3 days

The month with the highest number of rainy days is July (26.5 days).
The month with the least rainy days is February (16.4 days).

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Average sea temperature in September
Marigot Bay, Saint Lucia

Average sea temperature in September - Marigot Bay, Saint Lucia
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (27°C).

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Average daylight in September /
Average sunshine in September
Marigot Bay, Saint Lucia

Average daylight in September / Average sunshine in September - Marigot Bay, Saint Lucia
  • Average daylight in September: 12.2h

Months with the longest days are June and July (Average daylight: 12.9h).
The month with the shortest days is December (Average daylight: 11.3h).

  • Average sunshine in September: 9.6h

The month with the most sunshine is April (Average sunshine: 9.8h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in September
Marigot Bay, Saint Lucia

Average sunshine days in September - Marigot Bay, Saint Lucia
  • Average sunshine days in September: 5.2 days

The month with the most sunshine days is January (7.8 days).
The month with the least sunshine days is July (0.8 days).

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Average UV index in September
Marigot Bay, Saint Lucia

Average UV index in September - Marigot Bay, Saint Lucia
  • Average UV index in September: 7

Months with the highest UV index are January, February, March, April, May, July, August, September, October, November and December (UV index 7).
The month with the lowest UV index is June (UV index 6).

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Average cloud cover in September
Marigot Bay, Saint Lucia

Average cloud cover in September - Marigot Bay, Saint Lucia
  • Average cloud cover in September: 40

Months with the most cloud cover are June and July (Cloud cover 48).
The month with the least cloud cover is February (Cloud cover 38).

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Average visibility in September
Marigot Bay, Saint Lucia

Average visibility in September - Marigot Bay, Saint Lucia
  • Average visibility in September: 10km

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

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