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 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
September and October are known as Frederiksted's warmest months, with an average high-temperature of 84.2°F (29°C).Heat index
In September, the heat index is calculated to be a tropical 93.2°F (34°C). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', evaluates the perceived heat by adding the effect of moisture in the air. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
In Frederiksted, the average relative humidity in September is 76%.Rainfall
In Frederiksted, in September, during 22.8 rainfall days, 4.09" (104mm) of precipitation is typically accumulated. In Frederiksted, during the entire year, the rain falls for 254.5 days and collects up to 29.49" (749mm) of precipitation.Daylight
In Frederiksted, the average length of the day in September is 12h and 14min.On the first day of September in Frederiksted, sunrise is at 6:05 am and sunset at 6:33 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:08 pm AST.
Sunshine
In Frederiksted, United States Virgin Islands, the average sunshine in September is 8.9h.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. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 7 in September suggests the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What is the hottest time of year in Frederiksted?
Is it hot in Frederiksted during September?
What is the average humidity in September in Frederiksted?
How many days does it rain in September in Frederiksted?
How many hours of daylight does Frederiksted have in September?
When are sunrise and sunset in September in Frederiksted?
How many hours of sunshine does Frederiksted have in September?
What are the months with the highest UV index in Frederiksted?
What are the months with the lowest UV index in Frederiksted?
What is the UV index intensity in September in Frederiksted?
Average temperature in September
Frederiksted, VI
- Average high temperature in September: 84.2°F
The warmest months (with the highest average high temperature) are September and October (84.2°F).
The month with the lowest average high temperature is March (78.8°F).
- Average low temperature in September: 81.9°F
The month with the highest average low temperature is October (82.2°F).
The coldest month (with the lowest average low temperature) is March (76.6°F).
Average pressure in September
Frederiksted, VI
- Average pressure in September: 29.92"Hg
The months with the highest atmospheric pressure are January, February and June (30.01"Hg).
The months with the lowest atmospheric pressure are October and November (29.9"Hg).
Average wind speed in September
Frederiksted, VI
- Average wind speed in September: 11.3mph
The windiest month (with the highest average wind speed) is July (14.7mph).
The calmest month (with the lowest average wind speed) is October (11mph).
Average humidity in September
Frederiksted, VI
- Average humidity in September: 76%
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 and December (75%).
Average rainfall in September
Frederiksted, VI
- Average rainfall in September: 4.09"
The wettest month (with the highest rainfall) is August (4.17").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Frederiksted, VI
- Average rainfall days in September: 22.8 days
The month with the highest number of rainy days is August (24.7 days).
The month with the least rainy days is February (16.7 days).
Average daylight in September /
Average sunshine in September
Frederiksted, 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 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
Frederiksted, VI
- Average sunshine days in September: 3.7 days
The month with the most sunshine days is March (7.6 days).
The month with the least sunshine days is August (1.8 days).
Average UV index in September
Frederiksted, 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
Frederiksted, VI
- Average cloud cover in September: 35
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
Frederiksted, 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).
Frederiksted, United States Virgin Islands, USA
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