September weather forecast
Charlotte Amalie, VI

The Charlotte Amalie Harbour within the United States Virgin Islands
The Charlotte Amalie Harbour within the United States Virgin Islands

Weather in September

September, the first month of the autumn in Charlotte Amalie, is also a moderately hot month, with an average temperature fluctuating between 81.3°F (27.4°C) and 84°F (28.9°C).

Temperature

With an average high-temperature of 84°F (28.9°C) and an average low-temperature of 81.3°F (27.4°C), September is the warmest month.

Heat index

The average heat index in September is computed to be a tropical 93.2°F (34°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, pregnancy, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact and may raise the 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.

Humidity

In Charlotte Amalie, the average relative humidity in September is 77%.

Rainfall

September is the month with the most rainfall in Charlotte Amalie. Rain falls for 22.2 days and accumulates 4.45" (113mm) of precipitation.

Ocean temperature

The month with the warmest seawater in Charlotte Amalie is September, with an average ocean temperature of 84.9°F (29.4°C).
Note: 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.

Daylight

In September, the average length of the day in Charlotte Amalie is 12h and 14min.
On the first day of the month, sunrise is at 6:05 am and sunset at 6:34 pm. On the last day of September, sunrise is at 6:09 am and sunset at 6:09 pm AST.

Sunshine

The average sunshine in September is 8.7h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Charlotte Amalie. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 the 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the warmest month in Charlotte Amalie?

The warmest month in Charlotte Amalie is September, with an average high-temperature of 84°F (28.9°C) and an average low-temperature of 81.3°F (27.4°C).

What is the temperature in September in Charlotte Amalie?

In September, in Charlotte Amalie, United States Virgin Islands, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 81.3°F (27.4°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 93.2°F (34°C).

What is the average humidity in September in Charlotte Amalie?

The average relative humidity in September in Charlotte Amalie is 77%.

What is the rainiest month in Charlotte Amalie?

The month with the most rainfall is September, when the rain falls for 22.2 days and typically aggregates up to 4.45" (113mm) of precipitation.

How much does it rain in Charlotte Amalie in September?

In September, the rain falls for 22.2 days. Throughout September, 4.45" (113mm) of precipitation is accumulated.

When is the ocean warmest in Charlotte Amalie?

The month with the warmest seawater is September, with an average ocean temperature of 84.9°F (29.4°C).

How warm is the water in September in Charlotte Amalie?

In September, the average ocean temperature in Charlotte Amalie, United States Virgin Islands, is 84.9°F (29.4°C). 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.

What is the average length of the day in September in Charlotte Amalie?

In Charlotte Amalie, the average day length in September is 12h and 14min.

What time are sunrise and sunset in September in Charlotte Amalie?

In September, on the first day of the month, sunrise is at 6:05 am and sunset at 6:34 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:09 pm AST.

How long on average sun shines in September in Charlotte Amalie?

In Charlotte Amalie, the average sunshine duration in September is 8.7h.

What is the month with the highest UV index in Charlotte Amalie?

The months with the highest UV index in Charlotte Amalie, United States Virgin Islands, are January through December, with an average maximum UV index of 7.

What are the months with the lowest UV index in Charlotte Amalie?

The months with the lowest UV index in Charlotte Amalie, United States Virgin Islands, are January through December, with an average maximum UV index of 7.

What is the UV index reading in September in Charlotte Amalie?

In September, the average daily maximum UV index in Charlotte Amalie is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.

Average temperature in September
Charlotte Amalie, VI

Average temperature in September - Charlotte Amalie, VI
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is September (84°F).
The month with the lowest average high temperature is March (78.4°F).

  • Average low temperature in September: 81.3°F

The month with the highest average low temperature is October (81.5°F).
The coldest month (with the lowest average low temperature) is March (75.7°F).

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Average pressure in September
Charlotte Amalie, VI

Average pressure in September - Charlotte Amalie, VI
  • Average pressure in September: 29.93"Hg

The months with the highest atmospheric pressure are January and February (30.02"Hg).
The months with the lowest atmospheric pressure are October and November (29.91"Hg).

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Average wind speed in September
Charlotte Amalie, VI

Average wind speed in September - Charlotte Amalie, VI
  • Average wind speed in September: 11.7mph

The windiest month (with the highest average wind speed) is July (15mph).
The calmest month (with the lowest average wind speed) is October (11.1mph).

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Average humidity in September
Charlotte Amalie, VI

Average humidity in September - Charlotte Amalie, VI
  • Average humidity in September: 77%

The months with the highest relative humidity are May, June, July and August (78%).
The months with the lowest relative humidity are January, February, March, October, November and December (75%).

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Average rainfall in September
Charlotte Amalie, VI

Average rainfall in September - Charlotte Amalie, VI
  • Average rainfall in September: 4.45"

The wettest month (with the highest rainfall) is September (4.45").
The driest month (with the least rainfall) is February (1.22").

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Average rainfall days in September
Charlotte Amalie, VI

Average rainfall days in September - Charlotte Amalie, VI
  • Average rainfall days in September: 22.2 days

The month with the highest number of rainy days is November (25.5 days).
The months with the least rainy days are February, March and June (18.2 days).

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Average sea temperature in September
Charlotte Amalie, VI

Average sea temperature in September - Charlotte Amalie, VI
  • Average sea temperature in September: 85°F

The best month for swimming (with the highest average sea temperature) is September (85°F).
The coldest month (with the lowest average sea temperature) is February (78.7°F).

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Average daylight in September /
Average sunshine in September
Charlotte Amalie, VI

Average daylight in September / Average sunshine in September - Charlotte Amalie, VI
  • Average daylight in September: 12h and 14min

The month with the longest days is June (Average daylight: 13h and 13min).
The month with the shortest days is December (Average daylight: 11h and 3min).

  • Average sunshine in September: 8h and 42min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).

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Average sunshine days in September
Charlotte Amalie, VI

Average sunshine days in September - Charlotte Amalie, VI
  • Average sunshine days in September: 5.2 days

The months with the most sunshine days are March and April (7.3 days).
The month with the least sunshine days is November (2.4 days).

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Average UV index in September
Charlotte Amalie, VI

Average UV index in September - Charlotte Amalie, VI
  • 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).

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Average cloud cover in September
Charlotte Amalie, VI

Average cloud cover in September - Charlotte Amalie, VI
  • Average cloud cover in September: 36

The months with the most cloud cover are May and July (Cloud cover 40).
The month with the least cloud cover is February (Cloud cover 33).

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Average visibility in September
Charlotte Amalie, VI

Average visibility in September - Charlotte Amalie, VI
  • 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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