September weather forecast
Port-au-Prince, Haiti

englishespañol中文
Share
A stack of structures on a hillside in Port-au-Prince, Haiti
A stack of structures on a hillside in Port-au-Prince, Haiti

Weather in September

The transition from summer to autumn sees a drop in temperatures with the maximum temperature decreasing to 29.8°C (85.6°F) and minimum to 21.3°C (70.3°F). However, the quantity of rainfall increases significantly, making September the month with the highest rainfall at 135mm (5.31") for the entire year in Port-au-Prince. Despite this, the sea remains perfectly warm at 29.8°C (85.6°F), perfect for snorkeling or diving. The city still enjoys 12.2 hours of daylight, providing plenty of time for sightseeing or exploring, albeit with an umbrella in hand. The wind speed also witnesses a swift drop to 6.5km/h (4mph), making the weather much more stagnant.

Temperature

Port-au-Prince signifies an average high-temperature of a moderately hot 29.8°C (85.6°F) in September, closely mirroring the 30.9°C (87.6°F) of August. The average low-temperature of 21.3°C (70.3°F) is witnessed in Port-au-Prince during September.

Heat index

September's mean heat index is estimated at a torrid 36°C (96.8°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In Port-au-Prince, the average relative humidity in September is 77%.

Rainfall

In Port-au-Prince, during September, the rain falls for 22.4 days and regularly aggregates up to 135mm (5.31") of precipitation. In Port-au-Prince, during the entire year, the rain falls for 227.4 days and collects up to 904mm (35.59") of precipitation.

Sea temperature

The month with the warmest seawater is September, with an average sea temperature of 29.8°C (85.6°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In September, the average length of the day in Port-au-Prince is 12h and 14min.
On the first day of September, sunrise is at 06:34 and sunset at 19:03. On the last day of the month, sunrise is at 06:39 and sunset at 18:38 EDT.

Sunshine

In Port-au-Prince, the average sunshine in September is 9.6h.

UV index

The months with the lowest UV index are January through May, July through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Take precautions against overexposure. Protection against sun damage is needed. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Alert! The Sun's UV rays are heightened by the reflection of sand and water.
[Resources]

Frequently asked questions

How hot does it get in Port-au-Prince in September?

The high-temperature, in September, in Port-au-Prince, is 29.8°C (85.6°F), while the low-temperature averages to 21.3°C (70.3°F). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is estimated at 36°C (96.8°F).

What is the average humidity in September in Port-au-Prince?

The average relative humidity in September in Port-au-Prince is 77%.

How much does it rain in Port-au-Prince in September?

In Port-au-Prince, Haiti, during September, the rain falls for 22.4 days and regularly aggregates up to 135mm (5.31") of precipitation.

When is the sea warmest in Port-au-Prince?

With an average sea temperature of 29.8°C (85.6°F), September is the month with the warmest seawater in Port-au-Prince, Haiti.

What is the sea water temperature in September in Port-au-Prince?

In Port-au-Prince, the average seawater temperature in September is 29.8°C (85.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Port-au-Prince?

In September, the average day length in Port-au-Prince, Haiti, is 12h and 14min.

What time are sunrise and sunset in September in Port-au-Prince?

On the first day of September in Port-au-Prince, sunrise is at 06:34 and sunset at 19:03. On the last day of the month, sunrise is at 06:39 and sunset at 18:38 EDT.

How long on average sun shines in September in Port-au-Prince?

In September, the average sunshine duration in Port-au-Prince is 9.6h.

What are the months with the lowest UV index in Port-au-Prince?

The months with the lowest UV index are January through May, July through December, with an average maximum UV index of 6.

What is the UV index reading in September in Port-au-Prince?

In Port-au-Prince, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.

Average temperature in September
Port-au-Prince, Haiti

Average temperature in September - Port-au-Prince, Haiti
  • Average high temperature in September: 29.8°C

The warmest month (with the highest average high temperature) is August (30.9°C).
The month with the lowest average high temperature is January (27.6°C).

  • Average low temperature in September: 21.3°C

The months with the highest average low temperature are August and September (21.3°C).
The coldest month (with the lowest average low temperature) is January (18.2°C).

[Resources]

Average pressure in September
Port-au-Prince, Haiti

Average pressure in September - Port-au-Prince, Haiti
  • Average pressure in September: 1013.2mbar

The month with the highest atmospheric pressure is January (1016.3mbar).
The month with the lowest atmospheric pressure is October (1012.5mbar).

[Resources]

Average wind speed in September
Port-au-Prince, Haiti

Average wind speed in September - Port-au-Prince, Haiti
  • Average wind speed in September: 6.5km/h

The windiest month (with the highest average wind speed) is June (9.2km/h).
The calmest month (with the lowest average wind speed) is September (6.5km/h).

[Resources]

Average humidity in September
Port-au-Prince, Haiti

Average humidity in September - Port-au-Prince, Haiti
  • Average humidity in September: 77%

The month with the highest relative humidity is November (80%).
The month with the lowest relative humidity is February (72%).

[Resources]

Average rainfall in September
Port-au-Prince, Haiti

Average rainfall in September - Port-au-Prince, Haiti
  • Average rainfall in September: 135mm

The wettest month (with the highest rainfall) is May (141mm).
The driest month (with the least rainfall) is January (12mm).

[Resources]

Average rainfall days in September
Port-au-Prince, Haiti

Average rainfall days in September - Port-au-Prince, Haiti
  • Average rainfall days in September: 22.4 days

The months with the highest number of rainy days are April and October (24.4 days).
The month with the least rainy days is January (9.9 days).

[Resources]

Average sea temperature in September
Port-au-Prince, Haiti

Average sea temperature in September - Port-au-Prince, Haiti
  • Average sea temperature in September: 29.8°C

The best month for swimming (with the highest average sea temperature) is September (29.8°C).
The coldest month (with the lowest average sea temperature) is February (26.8°C).

[Resources]

Average daylight in September /
Average sunshine in September
Port-au-Prince, Haiti

Average daylight in September / Average sunshine in September - Port-au-Prince, Haiti
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is February (Average sunshine: 7h and 12min).

[Resources]

Average sunshine days in September
Port-au-Prince, Haiti

Average sunshine days in September - Port-au-Prince, Haiti
  • Average sunshine days in September: 4.7 days

The month with the most sunshine days is December (19 days).
The month with the least sunshine days is April (3.3 days).

[Resources]

Average UV index in September
Port-au-Prince, Haiti

Average UV index in September - Port-au-Prince, Haiti
  • Average UV index in September: 6

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, March, April, May, July, August, September, October, November and December (UV index 6).

[Resources]

Average cloud cover in September
Port-au-Prince, Haiti

Average cloud cover in September - Port-au-Prince, Haiti
  • Average cloud cover in September: 27

The month with the most cloud cover is April (Cloud cover 35).
The month with the least cloud cover is December (Cloud cover 21).

[Resources]

Average visibility in September
Port-au-Prince, Haiti

Average visibility in September - Port-au-Prince, Haiti
  • Average visibility in September: 9km

The months with the highest visibility are February, March and June (10km).
The months with the lowest visibility are January, April, May, July, August, September, October, November and December (9km).

[Resources]

Port-au-Prince, Haiti

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location