September weather forecast
Santa Clotilde, São Tomé and Príncipe

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Weather in September

September in Santa Clotilde, São Tomé and Príncipe, signals a fresh wave of climbing temperatures. A fractional increase in the average temperature is noticeable, with amendments in other parameters being practically negligible. Rainfall experiences a slight surge from the past month, but the weather remains generally predictable. October transitions similarly, with rainfall experiencing a marked spike.

Temperature

Santa Clotilde ushers in September with an average high-temperature of a still moderately hot 25.5°C (77.9°F), showing a close resemblance to the previous month. An average low-temperature of 24.6°C (76.3°F) characterizes Santa Clotilde's September nights.

Humidity

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

Rainfall

In Santa Clotilde, São Tomé and Príncipe, in September, it is raining for 15.8 days, with typically 35mm (1.38") of accumulated precipitation. In Santa Clotilde, during the entire year, the rain falls for 241.7 days and collects up to 1287mm (50.67") of precipitation.

Daylight

In Santa Clotilde, the average length of the day in September is 12h and 7min.
On the first day of September, sunrise is at 05:30 and sunset at 17:37. On the last day of the month, sunrise is at 05:20 and sunset at 17:27 GMT.

Sunshine

In Santa Clotilde, the average sunshine in September is 5.4h.

UV index

In Santa Clotilde, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high daily UV index of 6 during September translates into the following directions:
Ward off overexposure. Defence against solar harm is crucial. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.

Frequently asked questions

What is the temperature in September in Santa Clotilde?

The average high-temperature, in September, in Santa Clotilde, is 25.5°C (77.9°F), while the average low-temperature is 24.6°C (76.3°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in May is computed to be 31°C (87.8°F).

What is the most humid month in Santa Clotilde?

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

What is the average humidity in September in Santa Clotilde?

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

How many days does it rain in September in Santa Clotilde?

In Santa Clotilde, in September, it is raining for 15.8 days, with typically 35mm (1.38") of accumulated precipitation.

What is the average length of the day in September in Santa Clotilde?

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

When is the sunrise / sunset in September in Santa Clotilde?

On the first day of September in Santa Clotilde, São Tomé and Príncipe, sunrise is at 05:30 and sunset at 17:37. On the last day of the month, sunrise is at 05:20 and sunset at 17:27 GMT.

How many hours of sunshine does Santa Clotilde have in September?

In September, the average sunshine duration in Santa Clotilde, São Tomé and Príncipe, is 5.4h.

How high is the UV index in September in Santa Clotilde?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.

Average temperature in September
Santa Clotilde, São Tomé and Príncipe

Average temperature in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average pressure in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average wind speed in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average humidity in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average rainfall in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average rainfall days in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average daylight in September / Average sunshine in September - Santa Clotilde, 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 months with the shortest days are January, November and 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
Santa Clotilde, São Tomé and Príncipe

Average sunshine days in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average UV index in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average cloud cover in September - Santa Clotilde, 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
Santa Clotilde, São Tomé and Príncipe

Average visibility in September - Santa Clotilde, 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).

Santa Clotilde, São Tomé and Príncipe

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