September weather forecast
Santo Domingo, Dominican Republic

As the latter part of the year approaches, Santo Domingo's weather begins to give subtle hints of changing seasons. September maintains the high humidity and temperature levels of preceding months, but begins gearing towards milder seasonal norms. Shiny, hot days continue to be standard, with few intermissions of rain here and there. The highest rainfall frequency of 13 days foreshadows the impending drop in temperatures. Despite moisture challenges, the sights and energy of Santo Domingo remain irresistible, holding its place as a tropical paradise.

Temperature

Santo Domingo records an average high-temperature of a still hot 31.4°C (88.5°F) as September arrives, nearly mirroring the previous month's climate. During September nights, Santo Domingo witnesses a consistent average temperature of 22.7°C (72.9°F).

Heat index

The heat index value during September is computed to be a scorching 44°C (111.2°F). Stay on guard: Heat exhaustion and heat cramps are predicted. Ongoing effort can cause heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity in Santo Domingo is 85.1%.

Rainfall

In Santo Domingo, in September, it is raining for 11.8 days, with typically 181mm (7.13") of accumulated precipitation. In Santo Domingo, during the entire year, the rain falls for 115.4 days and collects up to 1447mm (56.97") of precipitation.

Sea temperature

With an average sea temperature of 29.3°C (84.7°F), September is the month with the warmest seawater in Santo Domingo.
Note: For swimming, diving, and similar activities, the water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered delightful, allowing for extended periods of enjoyment without discomfort.

Daylight

The average length of the day in September in Santo Domingo is 12h and 14min.
On the first day of September in Santo Domingo, sunrise is at 06:25 and sunset at 18:53. On the last day of the month, sunrise is at 06:30 and sunset at 18:28 AST.

Sunshine

In Santo Domingo, the average sunshine in September is 6.6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Santo Domingo. A UV Index estimate of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 12 translates into these guidelines:
Employ all critical precautions. Guarding against sun damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.