September weather forecast
San Fernando, Trinidad and Tobago

Weather in September

September, the first month of the autumn in San Fernando, is still a hot month, with an average temperature ranging between max 30.5°C (86.9°F) and min 26.5°C (79.7°F).

Temperature

The warmest month is September, with an average high-temperature of 30.5°C (86.9°F) and an average low-temperature of 26.5°C (79.7°F).

Heat index

The average heat index in September is calculated to be a very hot 38°C (100.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, clothing), and activity. 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. 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 San Fernando, the average relative humidity in September is 76%.

Rainfall

In September, in San Fernando, the rain falls for 18.8 days. Throughout September, 61mm (2.4") of precipitation is accumulated. Throughout the year, there are 202.6 rainfall days, and 599mm (23.58") of precipitation is accumulated.

Sea temperature

September is the month with the warmest seawater, with an average sea temperature of 29.3°C (84.7°F).
Note: 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.

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, in San Fernando, sunrise is at 05:54 and sunset at 17:57 AST.

Sunshine

August and September, with an average of 11.1h of sunshine, are months with the most sunshine in San Fernando.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index in San Fernando. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the warmest month in San Fernando?

With an average high-temperature of 30.5°C (86.9°F) and an average low-temperature of 26.5°C (79.7°F), September is the warmest month in San Fernando.

What is the temperature in September in San Fernando?

In September, in San Fernando, the average high-temperature is 30.5°C (86.9°F), and the average low-temperature is 26.5°C (79.7°F). in September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 38°C (100.4°F).

What is the average humidity in September in San Fernando?

The average relative humidity in September in San Fernando, Trinidad and Tobago, is 76%.

How much does it rain in San Fernando in September?

In San Fernando, during September, the rain falls for 18.8 days and regularly aggregates up to 61mm (2.4") of precipitation.

When is the sea warmest in San Fernando?

With an average sea temperature of 29.3°C (84.7°F), September is the month with the warmest seawater in San Fernando.

How warm is the water in September in San Fernando?

In September, the average sea temperature is 29.3°C (84.7°F). 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.

What is the average length of the day in September in San Fernando?

In San Fernando, the average day length in September is 12h and 11min.

What time are sunrise and sunset in September in San Fernando?

On the first day of September, 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 17:57 AST.

What are the months with the most sunshine in San Fernando?

August and September, with an average of 11.1h of sunshine, are months with the most sunshine.

How long on average sun shines in September in San Fernando?

In San Fernando, Trinidad and Tobago, the average sunshine duration in September is 11.1h.

What are the months with the highest UV index in San Fernando?

The months with the highest UV index in San Fernando are January through December, with an average maximum UV index of 7.

What are the months with the lowest UV index in San Fernando?

The months with the lowest UV index are January through December, with an average maximum UV index of 7.

What is the UV index reading in September in San Fernando?

The average daily maximum UV index in September in San Fernando is 7. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
San Fernando, Trinidad and Tobago

Average temperature in September - San Fernando, Trinidad and Tobago
  • Average high temperature in September: 30.5°C

The warmest month (with the highest average high temperature) is September (30.5°C).
The month with the lowest average high temperature is January (28.2°C).

  • Average low temperature in September: 26.5°C

The months with the highest average low temperature are September and October (26.5°C).
The coldest month (with the lowest average low temperature) is February (24.7°C).

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Average pressure in September
San Fernando, Trinidad and Tobago

Average pressure in September - San Fernando, Trinidad and Tobago
  • Average pressure in September: 1011.8mbar

The month with the highest atmospheric pressure is June (1013.7mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).

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Average wind speed in September
San Fernando, Trinidad and Tobago

Average wind speed in September - San Fernando, Trinidad and Tobago
  • Average wind speed in September: 13.2km/h

The windiest month (with the highest average wind speed) is May (17km/h).
The calmest month (with the lowest average wind speed) is August (12.6km/h).

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Average humidity in September
San Fernando, Trinidad and Tobago

Average humidity in September - San Fernando, Trinidad and Tobago
  • Average humidity in September: 76%

The months with the highest relative humidity are July, November and December (78%).
The months with the lowest relative humidity are March and April (74%).

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Average rainfall in September
San Fernando, Trinidad and Tobago

Average rainfall in September - San Fernando, Trinidad and Tobago
  • Average rainfall in September: 61mm

The wettest month (with the highest rainfall) is August (97mm).
The driest month (with the least rainfall) is April (17mm).

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Average rainfall days in September
San Fernando, Trinidad and Tobago

Average rainfall days in September - San Fernando, Trinidad and Tobago
  • Average rainfall days in September: 18.8 days

The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is April (11.6 days).

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Average sea temperature in September
San Fernando, Trinidad and Tobago

Average sea temperature in September - San Fernando, Trinidad and Tobago
  • Average sea temperature in September: 29.3°C

The best month for swimming (with the highest average sea temperature) is September (29.3°C).
The coldest month (with the lowest average sea temperature) is February (27.1°C).

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Average daylight in September /
Average sunshine in September
San Fernando, Trinidad and Tobago

Average daylight in September / Average sunshine in September - San Fernando, Trinidad and Tobago
  • Average daylight in September: 12h and 11min

The month with the longest days is June (Average daylight: 12h and 43min).
The month with the shortest days is December (Average daylight: 11h and 32min).

  • Average sunshine in September: 11h and 6min

The months with the most sunshine are August and September (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in September
San Fernando, Trinidad and Tobago

Average sunshine days in September - San Fernando, Trinidad and Tobago
  • Average sunshine days in September: 8.6 days

The month with the most sunshine days is April (14.3 days).
The month with the least sunshine days is July (5.6 days).

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Average UV index in September
San Fernando, Trinidad and Tobago

Average UV index in September - San Fernando, Trinidad and Tobago
  • Average UV index in September: 7

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

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Average cloud cover in September
San Fernando, Trinidad and Tobago

Average cloud cover in September - San Fernando, Trinidad and Tobago
  • Average cloud cover in September: 27

The month with the most cloud cover is June (Cloud cover 42).
The month with the least cloud cover is September (Cloud cover 27).

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Average visibility in September
San Fernando, Trinidad and Tobago

Average visibility in September - San Fernando, Trinidad and Tobago
  • Average visibility in September: 10km

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

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