September weather forecast and climate
Falmouth, Antigua and Barbuda

September, the first month of the autumn, in Falmouth, is still a warm month, with average temperature fluctuating between 27.7°C (81.9°F) and 28.8°C (83.8°F).

Temperature

September is the warmest month, with an average high-temperature of 28.8°C (83.8°F) and an average low-temperature of 27.7°C (81.9°F).

Heat index

In September, the average heat index is estimated at a hot 33.6°C (92.5°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, metabolic differences, clothing), 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in Falmouth is 77%.

Rainfall

In Falmouth, in September, it is raining for 23.3 days, with typically 88mm (3.46") of accumulated precipitation. Throughout the year, in Falmouth, there are 265.2 rainfall days, and 744mm (29.29") of precipitation is accumulated.

Sea temperature

September is the month with the warmest seawater, with an average sea temperature of 29.3°C (84.7°F).
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

The average length of the day in Falmouth is 12.2h.

Sunshine

Months with the most sunshine are April, August and September, with an average of 10.3h of sunshine.

UV index

Months with the highest UV index in Falmouth are January through December, with an average maximum UV index of 7. Months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the warmest month in Falmouth?

The warmest month is September, with an average high-temperature of 28.8°C (83.8°F) and an average low-temperature of 27.7°C (81.9°F).

What is the temperature in September in Falmouth?

In September, in Falmouth, the average high-temperature is 28.8°C (83.8°F), and the average low-temperature is 27.7°C (81.9°F). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines both air temperature and relative humidity, is estimated at 33.6°C (92.5°F).

What is the average humidity in September in Falmouth?

The average relative humidity in September in Falmouth, Antigua and Barbuda, is 77%.

How much does it rain in Falmouth in September?

In Falmouth, Antigua and Barbuda, during September, the rain falls for 23.3 days and regularly aggregates up to 88mm (3.46") of precipitation.

What is the month with the warmest sea water in Falmouth?

September is the month with the warmest seawater in Falmouth, Antigua and Barbuda, with an average sea temperature of 29.3°C (84.7°F).

What is the water temperature in September in Falmouth?

In Falmouth, in September, the average water temperature is 29.3°C (84.7°F). 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.

What is the average length of the day in September in Falmouth?

The average length of the day in September is 12.2h.

What is the month with the most sunshine in Falmouth?

April, August and September, with an average of 10.3h of sunshine, are months with the most sunshine in Falmouth.

How long on average sun shines in September in Falmouth?

In September, the average sunshine in Falmouth is 10.3h.

What is the month with the highest UV index in Falmouth?

Months with the highest UV index in Falmouth, Antigua and Barbuda, are January through December, with an average maximum UV index of 7.

When is the lowest UV index in Falmouth?

Months with the lowest UV index are January through December, with an average maximum UV index of 7.

What is the UV index intensity in September in Falmouth?

In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Falmouth, Antigua and Barbuda
  • Average high temperature in September: 28.8°C

The warmest month (with the highest average high temperature) is September (28.8°C).
The month with the lowest average high temperature is March (25.9°C).

  • Average low temperature in September: 27.7°C

The month with the highest average low temperature is October (27.9°C).
The coldest months (with the lowest average low temperature) are February and March (25°C).

Average pressure in September - Falmouth, Antigua and Barbuda
  • Average pressure in September: 1013.2mbar

The month with the highest atmospheric pressure is June (1016.3mbar).
Months with the lowest atmospheric pressure are October and November (1012.6mbar).

Average wind speed in September - Falmouth, Antigua and Barbuda
  • Average wind speed in September: 21.1km/h

The windiest month (with the highest average wind speed) is July (26.9km/h).
The calmest month (with the lowest average wind speed) is October (20.4km/h).

Average humidity in September - Falmouth, Antigua and Barbuda
  • Average humidity in September: 77%

Months with the highest relative humidity are May, July and August (78%).
Months with the lowest relative humidity are January, February and March (75%).

Average rainfall in September - Falmouth, Antigua and Barbuda
  • Average rainfall in September: 88mm

The wettest month (with the highest rainfall) is October (100mm).
The driest month (with the least rainfall) is February (23mm).

Average rainfall days in September - Falmouth, Antigua and Barbuda
  • Average rainfall days in September: 23.3 days

The month with the highest number of rainy days is July (24.8 days).
The month with the least rainy days is March (17.7 days).

Average sea temperature in September - Falmouth, Antigua and Barbuda
  • Average sea temperature in September: 29.3°C

The best month for swimming (with the highest average sea temperature) is September (29.3°C).
The coldest month (with the lowest average sea temperature) is February (26.3°C).

Average daylight in September / Average sunshine in September - Falmouth, Antigua and Barbuda
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.1h).
The month with the shortest days is December (Average daylight: 11.1h).

  • Average sunshine in September: 10.3h

Months with the most sunshine are April, August and September (Average sunshine: 10.3h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

Average sunshine days in September - Falmouth, Antigua and Barbuda
  • Average sunshine days in September: 3.3 days

The month with the most sunshine days is March (9.1 days).
The month with the least sunshine days is July (0.6 days).

Average UV index in September - Falmouth, Antigua and Barbuda
  • Average UV index in September: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
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 - Falmouth, Antigua and Barbuda
  • Average cloud cover in September: 38

Months with the most cloud cover are May, June and July (Cloud cover 43).
The month with the least cloud cover is February (Cloud cover 34).

Average visibility in September - Falmouth, Antigua and Barbuda
  • 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).