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September Weather in Sao Tome, Brazil

Last updated: August 22, 2025

In September, the average temperature in Sao Tome, Brazil hovers around 26°C (79°F). Expect a minimum of 19°C (66°F) and a maximum of 34°C (94°F), offering a warm climate. With an average humidity of 72%, you may also encounter some moisture in the air. Be prepared for a modest precipitation level of 8 mm (0.3 in) over the course of just 1 day.

September Temperature in Sao Tome

In September in Sao Tome, the average temperature is 26°C (79°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 19°C (66°F). This makes it an ideal time for travelers seeking warm weather and comfortable conditions.

September Weather in Sao Tome: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sao Tome, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sao Tome, September typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (94°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec818180797977767778808181
Data source: Temperature data for Sao Tome generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Sao Tome

In Sao Tome in September, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

September Precipitation Trends in Sao Tome

The chart displays monthly precipitation patterns in Sao Tome, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Sao Tome, September typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec3480987563335288111118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sao Tome

In Sao Tome in September, humidity is 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.

September Average Humidity in Sao Tome

This chart illustrates the average monthly humidity levels in Sao Tome, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Sao Tome is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%89%90%89%90%86%80%77%72%68%66%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sao Tome

In Sao Tome in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Sao Tome.

Maximum UV Index Levels in Sao Tome for September

The chart shows the monthly maximum UV Index (UVI) for Sao Tome in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Sao Tome typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141415141311111213131414
Data source: Sao Tome September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Sao Tome Compares to Other Months

Weather in Sao Tome varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sao Tome, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sao Tome, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (81°F)34 mm (1.3 inches)86%extreme
February Weather27°C (81°F)80 mm (3.1 inches)89%extreme
March Weather27°C (80°F)98 mm (3.9 inches)89%extreme
April Weather26°C (80°F)75 mm (2.9 inches)89%extreme
May Weather26°C (79°F)63 mm (2.5 inches)90%extreme
June Weather25°C (78°F)33 mm (1.3 inches)86%extreme
July Weather24°C (76°F)52 mm (2.1 inches)80%extreme
August Weather25°C (77°F)8 mm (0.3 inches)77%extreme
September Weather26°C (79°F)8 mm (0.3 inches)72%extreme
October Weather27°C (80°F)11 mm (0.4 inches)68%extreme
November Weather27°C (81°F)10 mm (0.4 inches)66%extreme
December Weather27°C (82°F)18 mm (0.7 inches)70%extreme

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