Basseterre
Saint Kitts and Nevis
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Basseterre, Saint Kitts and Nevis

A bridge across the lovely waters leading to Basseterre, Saint Kitts, and Nevis, with a distant view of the gorgeous mountain ranges
A bridge across the lovely waters leading to Basseterre, Saint Kitts, and Nevis, with a distant view of the gorgeous mountain ranges
The first month of the autumn, September, is still a hot month in Basseterre, Saint Kitts and Nevis, with average temperature fluctuating between 31°C (87.8°F) and 25°C (77°F).

Temperature

June through October, with an average high-temperature of 31°C (87.8°F), are the warmest months.

Rainfall

September is the month with the most rainfall. Rain falls for 18 days and accumulates 139mm (5.5") of precipitation.

Sea temperature

Months with the warmest seawater 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

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

Sunshine

January through March, May through December, with an average of 8h of sunshine, are months with the least sunshine.

UV index

Months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an excessive health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 12 in September transform into the following instructions:
Take all required precautions, as unprotected skin and eyes can burn in 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the warmest month in Basseterre?

Warmest months in Basseterre are June through October, with an average high-temperature of 31°C (87.8°F).

What is the temperature in September in Basseterre?

In September, the average high-temperature is 31°C (87.8°F), and the average low-temperature is 25°C (77°F).

How many days does it rain in September in Basseterre?

In September, the rain falls for 18 days. Throughout September, 139mm (5.5") of precipitation is accumulated.

What is the wettest month in Basseterre?

The month with the most rainfall is September when the rain falls for 18 days and typically aggregates up to 139mm (5.5") of precipitation.

What are the months with the warmest sea water in Basseterre?

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

How warm is the water in September in Basseterre?

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

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

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

What is the month with the least sunshine in Basseterre?

Months with the least sunshine are January through March, May through December, with an average of 8h of sunshine.

How long on average sun shines in September in Basseterre?

In Basseterre, Saint Kitts and Nevis, the average sunshine in September is 8h.

When is the highest UV index in Basseterre?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Basseterre, Saint Kitts and Nevis.

What is the UV index intensity in September in Basseterre?

The average daily maximum UV index in September in Basseterre is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Basseterre, Saint Kitts and Nevis
  • Average high temperature in September: 31°C

Warmest months (with the highest average high temperature) are June, July, August, September and October (31°C).
Months with the lowest average high temperature are January and February (28°C).

  • Average low temperature in September: 25°C

Months with the highest average low temperature are June, July, August, September and October (25°C).
Coldest months (with the lowest average low temperature) are January and February (22°C).

Average rainfall in September - Basseterre, Saint Kitts and Nevis
  • Average rainfall in September: 139mm

The wettest month (with the highest rainfall) is September (139mm).
The driest month (with the lowest rainfall) is March (36mm).

Average rainfall days in September - Basseterre, Saint Kitts and Nevis
  • Average rainfall days in September: 18 days

Months with the highest number of rainy days are October, November and December (20 days).
Months with the lowest number of rainy days are March, April and June (13 days).

Average sea temperature in September - Basseterre, Saint Kitts and Nevis
  • Average sea temperature in September: 29°C

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

Average daylight in September / Average sunshine in September - Basseterre, Saint Kitts and Nevis
  • 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: 11.1h).

  • Average sunshine in September: 8h

The month with most sunshine is April (Average sunshine: 9h).
Months with least sunshine are January, February, March, May, June, July, August, September, October, November and December (Average sunshine: 8).

Average UV index in September - Basseterre, Saint Kitts and Nevis
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).