September weather forecast
Willemstad, Curaçao

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The organized harbor city of Willemstad in Curaçao
The organized harbor city of Willemstad in Curaçao

Weather in September

As the city moves into the month of September, residents of Willemstad experience an incremental rise in the volume of rainfall. September sustains the warm conditions of August with a minor increase in highest temperature readings to 32.6°C (90.7°F). The marked upsurge of rainfall to 49mm (1.93"), coupled with constant relative humidity, underscores the advent of the wet season. Despite the increase in rainfall, there is only a marginal reduction in daylight hours and sunshine hours. All considered, September marks the confluence of warmth and enhanced rainfall, creating a unique tropical weather setting.

Temperature

Willemstad witnesses the warmest weather in September, with temperatures averaging a high of 32.6°C (90.7°F) and a low of 26.5°C (79.7°F).

Heat index

For September, the heat index is evaluated at a burning hot 45°C (113°F). Careful: Heat exhaustion and heat cramps are anticipated. With ongoing exertion, heatstroke becomes a possibility.
In terms of the heat index, values are set with light wind and shade conditions in mind. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. 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. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

In September, the average relative humidity in Willemstad is 77.5%.

Rainfall

In Willemstad, Curaçao, in September, during 4.6 rainfall days, 49mm (1.93") of precipitation is typically accumulated. Throughout the year, in Willemstad, Curaçao, there are 69.4 rainfall days, and 553mm (21.77") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater in Willemstad are September and October, with an average sea temperature of 29°C (84.2°F).
Note: Surface water temperatures falling between 25°C (77°F) and 29°C (84.2°F) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

In September, the average length of the day is 12h and 11min.
On the first day of the month, sunrise is at 06:24 and sunset at 18:45. On the last day of September, sunrise is at 06:24 and sunset at 18:26 AST.

Sunshine

In September, the average sunshine is 8.6h.

UV index

February through September, with an average maximum UV index of 12, are months with the highest UV index in Willemstad. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 12 in September, converts into the following recommendations:
Execute every important safeguard, as unprotected skin and eyes could burn within moments. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. A sunscreen boasting a minimum SPF of 30 should be generously applied and reapplied even on cloudy days, post swim or outdoor exercise. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.

Frequently asked questions

What is the warmest month in Willemstad?

Willemstad, Curaçao, records the warmest temperatures in September, averaging a high of 32.6°C (90.7°F) and a low of 26.5°C (79.7°F).

How hot does it get in Willemstad in September?

In September, in Willemstad, the average high-temperature is 32.6°C (90.7°F), and the average low-temperature is 26.5°C (79.7°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is evaluated at 45°C (113°F).

What is the average humidity in September in Willemstad?

In Willemstad, Curaçao, the average relative humidity in September is 77.5%.

How much does it rain in Willemstad in September?

In Willemstad, Curaçao, during September, the rain falls for 4.6 days and regularly aggregates up to 49mm (1.93") of precipitation.

When is the sea warmest in Willemstad?

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

How warm is the water in September in Willemstad?

In Willemstad, Curaçao, in September, the average water temperature is 29°C (84.2°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.

How many hours of daylight does Willemstad have in September?

In Willemstad, the average day length in September is 12h and 11min.

When are sunrise and sunset in September in Willemstad?

On the first day of September, sunrise is at 06:24 and sunset at 18:45. On the last day of the month, sunrise is at 06:24 and sunset at 18:26 AST.

How many hours of sunshine does Willemstad have in September?

In Willemstad, Curaçao, the average sunshine duration in September is 8.6h.

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

February through September, with an average maximum UV index of 12, are months with the highest UV index in Willemstad, Curaçao.

What is the UV index intensity in September in Willemstad?

The average daily maximum UV index in September in Willemstad, Curaçao, is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Willemstad, Curaçao

Average temperature in September - Willemstad, Curaçao
  • Average high temperature in September: 32.6°C

The warmest month (with the highest average high temperature) is September (32.6°C).
The month with the lowest average high temperature is January (29.7°C).

  • Average low temperature in September: 26.5°C

The month with the highest average low temperature is September (26.5°C).
The coldest month (with the lowest average low temperature) is January (24.3°C).

Average humidity in September
Willemstad, Curaçao

Average humidity in September - Willemstad, Curaçao
  • Average humidity in September: 77.5%

The month with the highest relative humidity is November (79.6%).
The month with the lowest relative humidity is March (76.1%).

Average rainfall in September
Willemstad, Curaçao

Average rainfall in September - Willemstad, Curaçao
  • Average rainfall in September: 48.6mm

The wettest month (with the highest rainfall) is December (99.8mm).
The driest month (with the least rainfall) is March (14.2mm).

Average rainfall days in September
Willemstad, Curaçao

Average rainfall days in September - Willemstad, Curaçao
  • Average rainfall days in September: 4.6 days

The month with the highest number of rainy days is December (11.5 days).
The month with the least rainy days is May (2 days).

Average sea temperature in September
Willemstad, Curaçao

Average sea temperature in September - Willemstad, Curaçao
  • 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 February and March (26°C).

Average daylight in September /
Average sunshine in September
Willemstad, Curaçao

Average daylight in September / Average sunshine in September - Willemstad, Curaçao
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 48min).
The month with the shortest days is December (Average daylight: 11h and 24min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is December (Average sunshine: 7h and 48min).

Average UV index in September
Willemstad, Curaçao

Average UV index in September - Willemstad, Curaçao
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

Willemstad, Curaçao

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