September weather forecast and climate
São Tomé, São Tomé and Príncipe

Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach
Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach

What is the temperature in September in São Tomé?

In September, in São Tomé, the average high-temperature is 28.6°C (83.5°F), and the average low-temperature is 21.3°C (70.3°F).

How many days does it rain in September in São Tomé?

In São Tomé, São Tomé and Príncipe, in September, during 6 rainfall days, typically 17mm (0.7") of precipitation is accumulated.
Average temperature in September - São Tomé, São Tomé and Príncipe
  • Average high temperature in September: 28.6°C

The warmest month (with the highest average high temperature) is March (30.2°C).
The month with the lowest average high temperature is July (27.3°C).

  • Average low temperature in September: 21.3°C

Months with the highest average low temperature are March, April and May (22.6°C).
The coldest month (with the lowest average low temperature) is July (20.4°C).

Average humidity in September - São Tomé, São Tomé and Príncipe
  • Average humidity in September: 79%

Months with the highest relative humidity are January, November and December (85%).
The month with the lowest relative humidity is July (77%).

Average rainfall in September - São Tomé, São Tomé and Príncipe
  • Average rainfall in September: 17mm

The wettest month (with the highest rainfall) is March (131mm).
The driest month (with the lowest rainfall) is July (0mm).

Average rainfall days in September - São Tomé, São Tomé and Príncipe
  • Average rainfall days in September: 6 days

Months with the highest number of rainy days are March and October (12 days).
The month with the lowest number of rainy days is July (2 days).

Average sea temperature in September - São Tomé, São Tomé and Príncipe
  • Average sea temperature in September: 26°C

Best months for swimming (with the highest average sea temperature) are February, March and April (29°C).
The coldest month (with the lowest average sea temperature) is July (25°C).

Average daylight in September / Average sunshine in September - São Tomé, São Tomé and Príncipe
  • Average daylight in September: 12.1h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).

  • Average sunshine in September: 4h

The month with most sunshine is June (Average sunshine: 5.5h).
The month with least sunshine is October (Average sunshine: 3.7h).

Average UV index in September - São Tomé, São Tomé and Príncipe
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
The month with the lowest UV index is July (UV index 10).

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