September weather forecast
Willemstad, Curaçao

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.