September Weather in San Fernando, Trinidad and Tobago

Last updated: August 31, 2025

In September, the average temperature in San Fernando, Trinidad and Tobago hovers around 27°C (81°F), with a minimum of 25°C (76°F) and a maximum soaring to 31°C (88°F). Expect a total precipitation of 147 mm (5.8 in) spread over 24 days, contributing to a humidity level of about 79%. Stay prepared for a warm and somewhat wet month!

September Temperature in San Fernando

In September in San Fernando, the average temperature is 27°C (81°F), with a maximum reaching 31°C (88°F) and a minimum as low as 25°C (76°F). It's an ideal time for travelers seeking warm weather and pleasant conditions.

September Weather in San Fernando: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Fernando, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Fernando, September typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (88°F) and lows dropping to around 25°C (76°F).

Data source: Temperature data for San Fernando generated using information from the Copernicus Climate Change Service.

September Precipitation in San Fernando

In San Fernando in September, the precipitation amount is 147 mm (5.8 in) spread over 24 days, indicating a relatively wet period for the region.

September Precipitation Trends in San Fernando

The chart displays monthly precipitation patterns in San Fernando, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In San Fernando, September typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 24 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in San Fernando

In San Fernando in September, humidity is 79%. With an average temperature of 27°C (81°F), this humidity feels like a warm and sticky embrace, making travel both challenging and invigorating as the air clings to your skin, urging you to seek shade or a refreshing drink.

September Average Humidity in San Fernando

This chart illustrates the average monthly humidity levels in San Fernando, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in San Fernando is approximately 79%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Fernando

In San Fernando in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Fernando, you can check here.

Maximum UV Index Levels in San Fernando for September

The chart shows the monthly maximum UV Index (UVI) for San Fernando in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in San Fernando typically reaches 14, which falls under the extreme exposure category.

Data source: San Fernando September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in San Fernando Compares to Other Months

Weather in San Fernando varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Fernando, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Fernando, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (78°F)	46 mm (1.8 inches)	78%	extreme
February Weather	26°C (79°F)	24 mm (0.9 inches)	77%	extreme
March Weather	26°C (79°F)	34 mm (1.3 inches)	76%	extreme
April Weather	27°C (80°F)	26 mm (1.0 inches)	75%	extreme
May Weather	27°C (81°F)	73 mm (2.9 inches)	76%	extreme
June Weather	27°C (80°F)	158 mm (6.2 inches)	80%	extreme
July Weather	27°C (80°F)	179 mm (7.0 inches)	83%	extreme
August Weather	27°C (81°F)	188 mm (7.4 inches)	80%	extreme
September Weather	27°C (81°F)	147 mm (5.8 inches)	79%	extreme
October Weather	27°C (81°F)	174 mm (6.9 inches)	79%	extreme
November Weather	27°C (80°F)	136 mm (5.3 inches)	81%	extreme
December Weather	26°C (79°F)	105 mm (4.1 inches)	80%	very high