September weather forecast
Port of Spain, Trinidad and Tobago

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The ancient building hosting the public library of the Port of Spain in Trinidad and Tobago
The ancient building hosting the public library of the Port of Spain in Trinidad and Tobago

Weather in September

Coming into September, the city experiences a drop in rainfall while maintaining consistent temperatures. The shift in weather brings about a slight relief, as the rainfall decreases from 244mm (9.61") in August to 191mm (7.52") in September. Though rainfall is still significant, it is less severe than the previous months, providing a refreshing break for the residents and visitors. The sun shines and humidity levels remain high, keeping the city life active and engaging. The weather remains a mix of sunshine, rain, and tropical warm winds that make the city vibrant.

Temperature

September's advent in Port of Spain, Trinidad and Tobago, denotes a minor fluctuation in the average high-temperature to a still hot 32.2°C (90°F) from August's 31.7°C (89.1°F). During September, Port of Spain observes a consistent average nighttime temperature of 23.1°C (73.6°F).

Heat index

For most parts of September, the heat index is computed to be a life-threatening hot 47°C (116.6°F). Observe: Heat exhaustion and heat cramps are probable. Heatstroke is on the horizon with prolonged exertion.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In Port of Spain, Trinidad and Tobago, the average relative humidity in September is 84%.

Rainfall

In Port of Spain, in September, it is raining for 16 days, with typically 191mm (7.52") of accumulated precipitation. In Port of Spain, during the entire year, the rain falls for 166 days and collects up to 1408mm (55.43") of precipitation.

Sea temperature

September is the month with the warmest seawater in Port of Spain, with an average sea temperature of 29°C (84.2°F).
Note: Water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm, making water activities enjoyable for prolonged periods without any uncomfortable sensations.

Daylight

The average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:15. On the last day of September, sunrise is at 05:54 and sunset at 17:56 AST.

Sunshine

In September, the average sunshine in Port of Spain is 6.6h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index in Port of Spain. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 12 during September translates into the following guidance:
Take all critical precautions, unprotected skin might burn swiftly. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Following every swim or outdoor workout, a sunscreen with an SPF of not less than 30 should be liberally applied and re-applied frequently, even on overcast days. Notice! The Sun's UV exposure elevates with sand and water reflections.

Frequently asked questions

How hot does it get in Port of Spain in September?

In Port of Spain, in September, the average high-temperature is 32.2°C (90°F), and the average low-temperature is 23.1°C (73.6°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is computed to be 47°C (116.6°F).

What is the average humidity in September in Port of Spain?

The average relative humidity in September in Port of Spain is 84%.

How many days does it rain in September in Port of Spain?

In September, the rain falls for 16 days. Throughout September, 191mm (7.52") of precipitation is accumulated.

What is the month with the warmest sea water in Port of Spain?

The month with the warmest seawater in Port of Spain is September, with an average sea temperature of 29°C (84.2°F).

What is the sea water temperature in September in Port of Spain?

In Port of Spain, in September, the average water temperature is 29°C (84.2°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 of Spain?

The average day length in September is 12h and 11min.

What time are sunrise and sunset in September in Port of Spain?

In September, on the first day of the month, sunrise is at 05:56 and sunset at 18:15. On the last day of the month, sunrise is at 05:54 and sunset at 17:56 AST.

How many hours of sunshine does Port of Spain have in September?

In Port of Spain, Trinidad and Tobago, the average sunshine duration in September is 6.6h.

What are the months with the highest UV index in Port of Spain?

February through October, with an average maximum UV index of 12, are months with the highest UV index in Port of Spain.

What is the UV index intensity in September in Port of Spain?

The average daily maximum UV index in September in Port of Spain is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Port of Spain, Trinidad and Tobago

Average temperature in September - Port of Spain, Trinidad and Tobago
  • Average high temperature in September: 32.2°C

The warmest month (with the highest average high temperature) is May (33.1°C).
The month with the lowest average high temperature is January (28°C).

  • Average low temperature in September: 23.1°C

The month with the highest average low temperature is June (23.3°C).
The coldest month (with the lowest average low temperature) is January (17°C).

Average humidity in September
Port of Spain, Trinidad and Tobago

Average humidity in September - Port of Spain, Trinidad and Tobago
  • Average humidity in September: 84%

The month with the highest relative humidity is November (86%).
The months with the lowest relative humidity are March and April (77%).

Average rainfall in September
Port of Spain, Trinidad and Tobago

Average rainfall in September - Port of Spain, Trinidad and Tobago
  • Average rainfall in September: 190.5mm

The wettest month (with the highest rainfall) is August (244mm).
The driest month (with the least rainfall) is March (16.9mm).

Average rainfall days in September
Port of Spain, Trinidad and Tobago

Average rainfall days in September - Port of Spain, Trinidad and Tobago
  • Average rainfall days in September: 16 days

The month with the highest number of rainy days is July (21 days).
The months with the least rainy days are March and April (6 days).

Average sea temperature in September
Port of Spain, Trinidad and Tobago

Average sea temperature in September - Port of Spain, Trinidad and Tobago
  • Average sea temperature in September: 29°C

The best month for swimming (with the highest average sea temperature) is September (29°C).
The coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight in September /
Average sunshine in September
Port of Spain, Trinidad and Tobago

Average daylight in September / Average sunshine in September - Port of Spain, Trinidad and Tobago
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).

  • Average sunshine in September: 6h and 4min

The month with the most sunshine is February (Average sunshine: 8h and 18min).
The month with the least sunshine is June (Average sunshine: 6h and 6min).

Average UV index in September
Port of Spain, Trinidad and Tobago

Average UV index in September - Port of Spain, Trinidad and Tobago
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 9).

Port of Spain, Trinidad and Tobago

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