Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With average high and low temperatures of 84°F (28.9°C) and 81.3°F (27.4°C) respectively, September is Charlotte Amalie's warmest month.Heat index
September's heat index is appraised at a tropical 93.2°F (34°C). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.Remember that heat index calculations are made for conditions in the shade with light wind. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
Humidity
In September, the average relative humidity is 77%.Rainfall
September is the month with the most rainfall. Rain falls for 22.2 days and accumulates 4.45" (113mm) of precipitation.Ocean temperature
September is the month with the warmest seawater in Charlotte Amalie, United States Virgin Islands, 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 perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.
Daylight
The average length of the day in September in Charlotte Amalie is 12h and 14min.On the first day of September, sunrise is at 6:05 am and sunset at 6:33 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 6:08 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. The months with the lowest UV index in Charlotte Amalie are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 7 during September translates into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Alert! UV radiation becomes sharper due to reflections from sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the warmest month in Charlotte Amalie?
How hot is it in Charlotte Amalie in September?
What is the average humidity in September in Charlotte Amalie?
What is the rainiest month in Charlotte Amalie?
How many days does it rain in September in Charlotte Amalie?
When is the ocean warmest in Charlotte Amalie?
What is the ocean temperature in September in Charlotte Amalie?
What is the average length of the day in September in Charlotte Amalie?
What time are sunrise and sunset in September in Charlotte Amalie?
How many hours of sunshine does Charlotte Amalie have in September?
What are the months with the highest UV index in Charlotte Amalie?
When is the lowest UV index in Charlotte Amalie?
What is the UV index reading in September in Charlotte Amalie?
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).
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).
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).
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%).
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").
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).
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: 12h and 1min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in September: 8h and 4min
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).
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).
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).
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).
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).
Charlotte Amalie, United States Virgin Islands, USA
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