September Weather forecast - Autumn forecast - Basseterre, Saint Kitts and Nevis

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

A bridge across the lovely waters leading to Basseterre, Saint Kitts, and Nevis

Weather in September

September, the first month of the autumn in Basseterre, is still a warm month, with an average temperature varying between 28.7°C (83.7°F) and 27.7°C (81.9°F).

Temperature

September is the warmest month, with an average high-temperature of 28.7°C (83.7°F) and an average low-temperature of 27.7°C (81.9°F).

Heat index

In September, the average heat index is computed to be a tropical 33°C (91.4°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 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, pregnancy). 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 particularly important for children. 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

In September, the average relative humidity is 77%.

Rainfall

In September, in Basseterre, the rain falls for 18.3 days. Throughout September, 50mm (1.97") of precipitation is accumulated. In Basseterre, during the entire year, the rain falls for 198.3 days and collects up to 386mm (15.2") of precipitation.

Sea temperature

The months with the warmest seawater in Basseterre, Saint Kitts and Nevis, are September and October, with an average sea temperature of 29°C (84.2°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

In Basseterre, Saint Kitts and Nevis, the average length of the day in September is 12h and 14min.
On the first day of September in Basseterre, sunrise is at 05:57 and sunset at 18:24. On the last day of the month, sunrise is at 06:00 and sunset at 18:00 AST.

Sunshine

In Basseterre, the average sunshine in September is 10.1h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The 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 hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

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FAQ

What is the warmest month in Basseterre?

With an average high-temperature of 28.7°C (83.7°F) and an average low-temperature of 27.7°C (81.9°F), September is the warmest month in Basseterre, Saint Kitts and Nevis.

What is the temperature in September in Basseterre?

In September, in Basseterre, Saint Kitts and Nevis, the average high-temperature is 28.7°C (83.7°F), and the average low-temperature is 27.7°C (81.9°F). in September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 33°C (91.4°F).

What is the average humidity in September in Basseterre?

The average relative humidity in September in Basseterre is 77%.

How many days does it rain in September in Basseterre?

In Basseterre, Saint Kitts and Nevis, during September, the rain falls for 18.3 days and regularly aggregates up to 50mm (1.97") of precipitation.

What months are the sea warmest in Basseterre?

September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Basseterre, Saint Kitts and Nevis.

How warm is the water in September in Basseterre?

In Basseterre, in September, the average water temperature is 29°C (84.2°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Basseterre have in September?

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

What time are sunrise and sunset in September in Basseterre?

In September, on the first day of the month, sunrise is at 05:57 and sunset at 18:24. On the last day of the month, in Basseterre, Saint Kitts and Nevis, sunrise is at 06:00 and sunset at 18:00 AST.

How long on average sun shines in September in Basseterre?

The average sunshine duration in September is 10.1h.

What are the months with the highest UV index in Basseterre?

January through December, with an average maximum UV index of 7, are months with the highest UV index.

What is the month with the lowest UV index in Basseterre?

The months with the lowest UV index in Basseterre, Saint Kitts and Nevis, are January through December, with an average maximum UV index of 7.

What is the UV index intensity in September in Basseterre?

In September, the average daily maximum UV index in Basseterre, Saint Kitts and Nevis, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

28.5°C 83.3°F

28.7°C 83.7°F

28.5°C 83.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

25.3km/h 15.7mph

20.8km/h 12.9mph

20.6km/h 12.8mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

18.8

18.3

18.8

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

7.7

8.4

8.6

Average UV index

Average cloud cover

39%

37%

Average visibility

10km 6.2mi

Average temperature in September
Basseterre, Saint Kitts and Nevis

Average high temperature in September: 28.7°C

The warmest month (with the highest average high temperature) is September (28.7°C).
The month with the lowest average high temperature is March (25.8°C).

Average low temperature in September: 27.7°C

The month with the highest average low temperature is October (27.8°C).
The coldest month (with the lowest average low temperature) is March (24.9°C).

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Average pressure in September
Basseterre, Saint Kitts and Nevis

Average pressure in September: 1013.2mbar

The months with the highest atmospheric pressure are January and June (1016.2mbar).
The months with the lowest atmospheric pressure are October and November (1012.5mbar).

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Average wind speed in September
Basseterre, Saint Kitts and Nevis

Average wind speed in September: 20.4km/h

The windiest month (with the highest average wind speed) is July (26.3km/h).
The calmest month (with the lowest average wind speed) is October (19.6km/h).

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Average humidity in September
Basseterre, Saint Kitts and Nevis

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 and December (75%).

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Average rainfall in September
Basseterre, Saint Kitts and Nevis

Average rainfall in September: 50mm

The wettest month (with the highest rainfall) is October (51mm).
The driest month (with the least rainfall) is February (15mm).

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Average rainfall days in September
Basseterre, Saint Kitts and Nevis

Average rainfall days in September: 18.3 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (12.6 days).

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Average sea temperature in September
Basseterre, Saint Kitts and Nevis

Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February and March (26°C).

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Average daylight in September /
Average sunshine in September
Basseterre, Saint Kitts and Nevis

Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 6min).

Average sunshine in September: 10h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in September
Basseterre, Saint Kitts and Nevis

Average sunshine days in September: 8.4 days

The month with the most sunshine days is June (11.2 days).
The month with the least sunshine days is May (7.6 days).

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Average UV index in September
Basseterre, Saint Kitts and Nevis

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
Basseterre, Saint Kitts and Nevis

Average cloud cover in September: 37

The months with the most cloud cover are May, June and July (Cloud cover 40).
The month with the least cloud cover is February (Cloud cover 32).

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Average visibility in September
Basseterre, Saint Kitts and Nevis

Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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September weather forecast
Basseterre, Saint Kitts and Nevis

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