September weather forecast
Guadalupe, São Tomé and Príncipe

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Weather in September

September in Guadalupe marks a gradual retreat of the cool wind. The month registers a dip in wind speed, clocking an average of 16.8km/h (10.4mph), while humidity holds steady at 83%. A visible increase in the high-temperature manifest, recording 25.5°C (77.9°F), alluding to a warming trend. Rainfall shows a significant rise compared to the previous month, making September one of the wettest periods. The city starts to regain its tropical character during this month, with the weather gradually veering towards typical warm and humid conditions.

Temperature

The onset of September brings with it an average high-temperature of a still moderately hot 25.5°C (77.9°F), showing a negligible variation from the month before. Nights in September exhibit a minor reduction to an average low temperature of 24.6°C (76.3°F).

Humidity

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

Rainfall

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

Daylight

In Guadalupe, São Tomé and Príncipe, the average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 05:29 and sunset at 17:36. On the last day of September, 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 of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Shield from overexposure. Defense against sun-related harm is required. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.

Frequently asked questions

What are the temperatures in Guadalupe in September?

In September, the average high-temperature and low-temperature are 25.5°C (77.9°F) and 24.6°C (76.3°F) respectively. In May, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 31°C (87.8°F).

What are the most humid months in Guadalupe?

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

What is the average humidity in September in Guadalupe?

In September, the average relative humidity in Guadalupe, São Tomé and Príncipe, is 83%.

How much does it rain in Guadalupe in September?

In Guadalupe, during September, the rain falls for 15.8 days and regularly aggregates up to 35mm (1.38") of precipitation.

What is the average length of the day in September in Guadalupe?

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

What time are sunrise and sunset in September in Guadalupe?

On the first day of September in Guadalupe, São Tomé and Príncipe, 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 many hours of sunshine does Guadalupe have in September?

The average sunshine duration in September in Guadalupe is 5.4h.

What is the UV index reading in September in Guadalupe?

The average daily maximum UV index in September in Guadalupe, São Tomé and Príncipe, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.

Average temperature in September
Guadalupe, São Tomé and Príncipe

Average temperature in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average pressure in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average wind speed in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average humidity in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average rainfall in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average rainfall days in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average daylight in September / Average sunshine in September - Guadalupe, 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 December (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
Guadalupe, São Tomé and Príncipe

Average sunshine days in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average UV index in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average cloud cover in September - Guadalupe, 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
Guadalupe, São Tomé and Príncipe

Average visibility in September - Guadalupe, 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).

Guadalupe, São Tomé and Príncipe

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