September Weather in Brazzaville, Congo

Last updated: August 23, 2025

In Brazzaville, Congo, the average temperature in September is a delightful 26°C (79°F). Daily temperatures can range from a comfortable 19°C (66°F) to a sizzling 35°C (96°F). Expect some rain, with 24 mm (0.9 in) of precipitation spread over 6 days, and humidity levels hovering around 78%. Prepare for a warm and slightly humid experience!

September Temperature in Brazzaville

In September in Brazzaville, the average temperature is 26°C (79°F). The maximum can reach 35°C (96°F), and the minimum can be as low as 19°C (66°F). This pleasant climate makes it an ideal time to explore the outdoor attractions and enjoy the local culture.

September Weather in Brazzaville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Brazzaville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brazzaville, September typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (96°F) and lows dropping to around 19°C (66°F).

Data source: Temperature data for Brazzaville generated using information from the Copernicus Climate Change Service.

September Precipitation in Brazzaville

In Brazzaville in September, the total precipitation amount is 24 mm (0.9 in) over a span of 6 days.

September Precipitation Trends in Brazzaville

The chart displays monthly precipitation patterns in Brazzaville, 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 Brazzaville, September typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Brazzaville

In Brazzaville in September, humidity is 78%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket wrapping around you, making travel a bit sluggish as the air hangs thick, leaving you in need of frequent breaks to hydrate and find shade.

September Average Humidity in Brazzaville

This chart illustrates the average monthly humidity levels in Brazzaville, 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 Brazzaville is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brazzaville

In Brazzaville in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Brazzaville.

Maximum UV Index Levels in Brazzaville for September

The chart shows the monthly maximum UV Index (UVI) for Brazzaville 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 Brazzaville typically reaches 10, which falls under the very high exposure category.

Data source: Brazzaville 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 Brazzaville Compares to Other Months

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

This table compares monthly weather conditions in Brazzaville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	99 mm (3.9 inches)	88%	extreme
February Weather	26°C (80°F)	127 mm (5.0 inches)	88%	extreme
March Weather	27°C (80°F)	101 mm (4.0 inches)	86%	extreme
April Weather	27°C (80°F)	129 mm (5.1 inches)	87%	extreme
May Weather	26°C (80°F)	85 mm (3.3 inches)	88%	extreme
June Weather	25°C (77°F)	6 mm (0.2 inches)	86%	very high
July Weather	24°C (75°F)	3 mm (0.1 inches)	77%	very high
August Weather	25°C (77°F)	7 mm (0.3 inches)	74%	very high
September Weather	26°C (79°F)	24 mm (0.9 inches)	78%	very high
October Weather	26°C (79°F)	157 mm (6.2 inches)	87%	extreme
November Weather	26°C (79°F)	193 mm (7.6 inches)	91%	extreme
December Weather	26°C (78°F)	172 mm (6.8 inches)	92%	extreme