September weather forecast
Trindade, São Tomé and Príncipe

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Weather in September

September brings an increase in rainfall and temperatures after the mild respite in August. A marked increase in cloud cover accompanies the escalated rainfall, yet sunshine hours are on a steady rise. The returning winds blow at a reasonably steady speed, mitigating the increased humidity and heat levels. The weather conditions create a lush and verdant environment, amplifying the tropical allure of Trindade.

Temperature

With the onset of September, a modest change to a still moderately hot 25.5°C (77.9°F) from August's 24.8°C (76.6°F) is noted in high-temperature. Trindade's average low temperature, barely cooler than the daytime high, steadies at a still moderately hot 24.6°C (76.3°F) during September.

Humidity

The months with the highest humidity are August through October, with an average relative humidity of 83%.

Rainfall

In September, the rain falls for 15.8 days. Throughout September, 35mm (1.38") of precipitation is accumulated. Throughout the year, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.

Daylight

In Trindade, São Tomé and Príncipe, the average length of the day in September is 12h and 7min.
On the first day of September in Trindade, sunrise is at 05:29 and sunset at 17:36. On the last day of the month, sunrise is at 05:19 and sunset at 17:26 GMT.

Sunshine

The average sunshine in September is 5.4h.

UV index

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In September, an average UV index of 6 transforms into the following instructions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.

Frequently asked questions

What is the usual temperature for Trindade in September?

The average high-temperature, in September, in Trindade, is 25.5°C (77.9°F), while the average low-temperature is 24.6°C (76.3°F). In May, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 31°C (87.8°F).

What is the most humid month in Trindade?

August through October, with an average relative humidity of 83%, are most humid months.

What is the average humidity in September?

In September, the average relative humidity is 83%.

How many days does it rain in September?

In Trindade, in September, during 15.8 rainfall days, 35mm (1.38") of precipitation is typically accumulated.

How many hours of daylight does Trindade have in September?

In September, the average day length is 12h and 7min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 05:29 and sunset at 17:36. On the last day of the month, sunrise is at 05:19 and sunset at 17:26 GMT.

How long on average sun shines in September?

In Trindade, the average sunshine duration in September is 5.4h.

What is the UV index reading in September?

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

Average temperature in September
Trindade, São Tomé and Príncipe

Average temperature in September - Trindade, São Tomé and Príncipe
  • Average high temperature in September: 25.5°C

The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).

  • Average low temperature in September: 24.6°C

The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).

Average pressure in September
Trindade, São Tomé and Príncipe

Average pressure in September - Trindade, São Tomé and Príncipe
  • Average pressure in September: 1013.1mbar

The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).

Average wind speed in September
Trindade, São Tomé and Príncipe

Average wind speed in September - Trindade, São Tomé and Príncipe
  • Average wind speed in September: 16.8km/h

The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).

Average humidity in September
Trindade, São Tomé and Príncipe

Average humidity in September - Trindade, São Tomé and Príncipe
  • Average humidity in September: 83%

The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).

Average rainfall in September
Trindade, São Tomé and Príncipe

Average rainfall in September - Trindade, São Tomé and Príncipe
  • Average rainfall in September: 35mm

The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).

Average rainfall days in September
Trindade, São Tomé and Príncipe

Average rainfall days in September - Trindade, São Tomé and Príncipe
  • Average rainfall days in September: 15.8 days

The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).

Average daylight in September /
Average sunshine in September
Trindade, São Tomé and Príncipe

Average daylight in September / Average sunshine in September - Trindade, São Tomé and Príncipe
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 6min).
The month with the shortest days is November (Average daylight: 12h and 6min).

  • Average sunshine in September: 5h and 2min

The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).

Average sunshine days in September
Trindade, São Tomé and Príncipe

Average sunshine days in September - Trindade, São Tomé and Príncipe
  • Average sunshine days in September: 5.3 days

The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).

Average UV index in September
Trindade, São Tomé and Príncipe

Average UV index in September - Trindade, São Tomé and Príncipe
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).

Average cloud cover in September
Trindade, São Tomé and Príncipe

Average cloud cover in September - Trindade, São Tomé and Príncipe
  • Average cloud cover in September: 62

The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).

Average visibility in September
Trindade, São Tomé and Príncipe

Average visibility in September - Trindade, São Tomé and Príncipe
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).

Trindade, São Tomé and Príncipe

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