September weather forecast
Port of Spain, Trinidad and Tobago

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.