Charlotte Amalie
United States Virgin Islands, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Charlotte Amalie, VI

An aerial night view of the Charlotte Amalie Harbour within the United States Virgin Islands
An aerial night view of the Charlotte Amalie Harbour within the United States Virgin Islands
September, the first month of the autumn, in Charlotte Amalie, is also a hot month, with average temperature varying between 78.1°F (25.6°C) and 90°F (32.2°C).

Temperature

In Charlotte Amalie, the average high-temperature in September is essentially the same as in August - a still hot 90°F (32.2°C). In September, the average low-temperature is 78.1°F (25.6°C).

Rainfall

In Charlotte Amalie, it is raining for 14.6 days, with typically 4.8" (122.4mm) of accumulated precipitation. In Charlotte Amalie, during the entire year, the rain falls for 163.7 days and collects up to 38.9" (989.1mm) of precipitation.

Ocean temperature

September is the month with the warmest seawater, with an average ocean temperature of 84.9°F (29.4°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in Charlotte Amalie is 12.2h.

Sunshine

The average sunshine in Charlotte Amalie, United States Virgin Islands, is 8h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Charlotte Amalie?

In September, in Charlotte Amalie, United States Virgin Islands, the average high-temperature is 90°F (32.2°C), and the average low-temperature is 78.1°F (25.6°C).

How much does it rain in Charlotte Amalie in September?

In Charlotte Amalie, United States Virgin Islands, in September, it is raining for 14.6 days, with typically 4.8" (122.4mm) of accumulated precipitation.

What is the month with the warmest ocean in Charlotte Amalie?

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

What is the water temperature in September in Charlotte Amalie?

In Charlotte Amalie, in September, the average water temperature is 84.9°F (29.4°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

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

The average length of the day in September in Charlotte Amalie, United States Virgin Islands, is 12.2h.

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

In September, the average sunshine in Charlotte Amalie, United States Virgin Islands, is 8h.

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

Months with the highest UV index in Charlotte Amalie are March through September, with an average maximum UV index of 12.

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

In September, the average daily maximum UV index in Charlotte Amalie, United States Virgin Islands, is 12. A UV Index of 11, and more, symbolizes an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in September - Charlotte Amalie, VI
  • Average high temperature in September: 90°F

The warmest month (with the highest average high temperature) is August (90.2°F).
Months with the lowest average high temperature are January and February (85.1°F).

  • Average low temperature in September: 78°F

The month with the highest average low temperature is August (78.1°F).
The coldest month (with the lowest average low temperature) is February (72.3°F).

Average rainfall in September - Charlotte Amalie, VI
  • Average rainfall in September: 4.8"

The wettest month (with the highest rainfall) is November (6").
The driest month (with the lowest rainfall) is March (1.1").

Average rainfall days in September - Charlotte Amalie, VI
  • Average rainfall days in September: 14.6 days

The month with the highest number of rainy days is November (17.8 days).
The month with the lowest number of rainy days is March (8.1 days).

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).

Average daylight in September / Average sunshine in September - Charlotte Amalie, VI
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in September: 8h

Months with most sunshine are March, April, July and August (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 7).

Average UV index in September - Charlotte Amalie, VI
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).