September weather forecast
Saint-Marc, Haiti

Weather in September

The first month of the autumn, September, is still a warm month in Saint-Marc, Haiti, with average temperature fluctuating between 29.8°C (85.6°F) and 23.1°C (73.6°F).

Temperature

In September, the average high-temperature is relatively the same as in August - a warm 29.8°C (85.6°F). The average low-temperature, in Saint-Marc, is 23.1°C (73.6°F).

Heat index

In September, the average heat index is appraised at a very hot 36.8°C (98.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, differences in body mass, height, and shape, pregnancy). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In September, the average relative humidity is 79%.

Rainfall

In September, in Saint-Marc, the rain falls for 23.6 days. Throughout September, 101mm (3.98") of precipitation is accumulated. In Saint-Marc, during the entire year, the rain falls for 219.6 days and collects up to 736mm (28.98") of precipitation.

Sea temperature

September is the month with the warmest seawater in Saint-Marc, with an average sea temperature of 29.9°C (85.8°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

The average sunshine in Saint-Marc is 10.1h.

UV index

Months with the highest UV index in Saint-Marc, Haiti, are April through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Saint-Marc?

In September, in Saint-Marc, the average high-temperature is 29.8°C (85.6°F), and the average low-temperature is 23.1°C (73.6°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is appraised at 36.8°C (98.2°F).

What is the average humidity in September in Saint-Marc?

In September, the average relative humidity in Saint-Marc is 79%.

How much does it rain in Saint-Marc in September?

In September, in Saint-Marc, the rain falls for 23.6 days. Throughout September, 101mm (3.98") of precipitation is accumulated.

When is the sea warmest in Saint-Marc?

The month with the warmest seawater is September, with an average sea temperature of 29.9°C (85.8°F).

What is the sea water temperature in September in Saint-Marc?

In Saint-Marc, Haiti, in September, the average water temperature is 29.9°C (85.8°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 Saint-Marc have in September?

In Saint-Marc, the average length of the day in September is 12.2h.

How many hours of sunshine does Saint-Marc have in September?

In September, the average sunshine is 10.1h.

What are the months with the highest UV index in Saint-Marc?

April through September, with an average maximum UV index of 7, are months with the highest UV index in Saint-Marc, Haiti.

How high is the UV index in September in Saint-Marc?

The average daily maximum UV index in September in Saint-Marc, Haiti, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Saint-Marc, Haiti

Average temperature in September - Saint-Marc, Haiti
  • Average high temperature in September: 29.8°C

The warmest month (with the highest average high temperature) is July (30.7°C).
The month with the lowest average high temperature is January (27.3°C).

  • Average low temperature in September: 23.1°C

The month with the highest average low temperature is July (23.5°C).
The coldest month (with the lowest average low temperature) is January (20.1°C).

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Average pressure in September
Saint-Marc, Haiti

Average pressure in September - Saint-Marc, Haiti
  • Average pressure in September: 1013.2mbar

The month with the highest atmospheric pressure is January (1016.6mbar).
The month with the lowest atmospheric pressure is October (1012.5mbar).

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Average wind speed in September
Saint-Marc, Haiti

Average wind speed in September - Saint-Marc, Haiti
  • Average wind speed in September: 7km/h

The windiest month (with the highest average wind speed) is February (11.2km/h).
The calmest month (with the lowest average wind speed) is September (7km/h).

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Average humidity in September
Saint-Marc, Haiti

Average humidity in September - Saint-Marc, Haiti
  • Average humidity in September: 79%

The month with the highest relative humidity is November (81%).
Months with the lowest relative humidity are March and April (74%).

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Average rainfall in September
Saint-Marc, Haiti

Average rainfall in September - Saint-Marc, Haiti
  • Average rainfall in September: 101mm

The wettest month (with the highest rainfall) is May (118mm).
The driest months (with the least rainfall) are January and December (13mm).

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Average rainfall days in September
Saint-Marc, Haiti

Average rainfall days in September - Saint-Marc, Haiti
  • Average rainfall days in September: 23.6 days

The month with the highest number of rainy days is May (25.3 days).
The month with the least rainy days is December (8.5 days).

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Average sea temperature in September
Saint-Marc, Haiti

Average sea temperature in September - Saint-Marc, Haiti
  • Average sea temperature in September: 29.9°C

The best month for swimming (with the highest average sea temperature) is September (29.9°C).
The coldest month (with the lowest average sea temperature) is February (26.8°C).

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Average daylight in September /
Average sunshine in September
Saint-Marc, Haiti

Average daylight in September / Average sunshine in September - Saint-Marc, Haiti
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.3h).
The month with the shortest days is December (Average daylight: 11h).

  • Average sunshine in September: 10.1h

Months with the most sunshine are July and August (Average sunshine: 11.3h).
Months with the least sunshine are January and February (Average sunshine: 7.2).

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Average sunshine days in September
Saint-Marc, Haiti

Average sunshine days in September - Saint-Marc, Haiti
  • Average sunshine days in September: 3.2 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is September (3.2 days).

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Average UV index in September
Saint-Marc, Haiti

Average UV index in September - Saint-Marc, Haiti
  • Average UV index in September: 7

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

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Average cloud cover in September
Saint-Marc, Haiti

Average cloud cover in September - Saint-Marc, Haiti
  • Average cloud cover in September: 24

The month with the most cloud cover is May (Cloud cover 32).
The month with the least cloud cover is December (Cloud cover 18).

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Average visibility in September
Saint-Marc, Haiti

Average visibility in September - Saint-Marc, Haiti
  • Average visibility in September: 10km

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

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