Santo Domingo
Dominican Republic
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Santo Domingo, Dominican Republic

The Palace building in Santo Domingo, housing the National offices of the President and Vice President of the Dominican Republic
The Palace building in Santo Domingo, housing the National offices of the President and Vice President of the Dominican Republic
The first month of the autumn, September, is still a hot month in Santo Domingo, Dominican Republic, with temperature in the range of an average high of 31.4°C (88.5°F) and an average low of 22.7°C (72.9°F).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 31.4°C (88.5°F). In Santo Domingo, in September, the average low-temperature is 22.7°C (72.9°F).

Heat index

In September, the average heat index is calculated to a blistering 44.3°C (111.7°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
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 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like clothing, differences in body mass, height, and shape, wind, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. 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 is 85.1%.

Rainfall

In Santo Domingo, during September, the rain falls for 11.8 days and regularly aggregates up to 180.9mm (7.1") of precipitation. In Santo Domingo, Dominican Republic, during the entire year, the rain falls for 115.4 days and collects up to 1447.1mm (57") of precipitation.

Sea temperature

September is the month with the warmest seawater, with an average sea temperature of 29.3°C (84.7°F).
Note: 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.

Daylight

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

Sunshine

In Santo Domingo, Dominican Republic, 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. A UV Index estimate of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Santo Domingo?

In September, in Santo Domingo, Dominican Republic, the average high-temperature is 31.4°C (88.5°F), and the average low-temperature is 22.7°C (72.9°F). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, is calculated to 44.3°C (111.7°F).

What is the average humidity in September in Santo Domingo?

The average relative humidity in September is 85.1%.

How much does it rain in Santo Domingo in September?

In Santo Domingo, in September, during 11.8 rainfall days, 180.9mm (7.1") of precipitation is typically accumulated.

When is the sea warmest in Santo Domingo?

The month with the warmest seawater in Santo Domingo is September, with an average sea temperature of 29.3°C (84.7°F).

How warm is the water in September in Santo Domingo?

In Santo Domingo, in September, the average water temperature is 29.3°C (84.7°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 Santo Domingo?

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

How long on average sun shines in September in Santo Domingo?

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

When is the highest UV index in Santo Domingo?

Months with the highest UV index are March through September, with an average maximum UV index of 12.

How high is the UV index in September in Santo Domingo?

In Santo Domingo, Dominican Republic, the average daily maximum UV index in September is 12. A UV Index reading of 11, and higher, represents an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in September - Santo Domingo, Dominican Republic
  • Average high temperature in September: 31.4°C

The warmest month (with the highest average high temperature) is August (31.5°C).
Months with the lowest average high temperature are January and February (29.2°C).

  • Average low temperature in September: 22.7°C

The month with the highest average low temperature is June (22.9°C).
The coldest month (with the lowest average low temperature) is January (19.6°C).

Average humidity in September - Santo Domingo, Dominican Republic
  • Average humidity in September: 85.1%

The month with the highest relative humidity is October (85.7%).
The month with the lowest relative humidity is April (78.8%).

Average rainfall in September - Santo Domingo, Dominican Republic
  • Average rainfall in September: 180.9mm

The wettest month (with the highest rainfall) is May (187.7mm).
The driest month (with the lowest rainfall) is March (53.8mm).

Average rainfall days in September - Santo Domingo, Dominican Republic
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is October (13 days).
Months with the lowest number of rainy days are February and March (6.3 days).

Average sea temperature in September - Santo Domingo, Dominican Republic
  • Average sea temperature in September: 29.3°C

The best month for swimming (with the highest average sea temperature) is September (29.3°C).
Coldest months (with the lowest average sea temperature) are February and March (26.3°C).

Average daylight in September / Average sunshine in September - Santo Domingo, Dominican Republic
  • 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: 11h).

  • Average sunshine in September: 6.6h

The month with most sunshine is March (Average sunshine: 7.4h).
Months with least sunshine are January and December (Average sunshine: 5.7).

Average UV index in September - Santo Domingo, Dominican Republic
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).