September Weather in Cacheu, Guinea-Bissau

Last updated: August 23, 2025

In September, the average temperature in Cacheu, Guinea-Bissau hovers around 27°C (82°F), with minimums dipping to 23°C (74°F) and maximums soaring to 35°C (96°F). Expect a significant amount of rain, with 318 mm (12.5 in) falling over 25 days. The air is quite humid too, with an average humidity level of 84%, creating a warm and tropical atmosphere.

September Temperature in Cacheu

In September in Cacheu, the average temperature is 27°C (82°F). Maximums can reach 35°C (96°F), while minimums can drop to as low as 23°C (74°F). This mild and warm weather makes Cacheu an ideal destination for travelers looking to enjoy pleasant outdoor activities.

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

The chart illustrates September temperature patterns in Cacheu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cacheu, September typically has an average temperature of 27°C (82°F), with highs reaching up to 35°C (96°F) and lows dropping to around 23°C (74°F).

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

September Precipitation in Cacheu

In Cacheu in September, the precipitation amount is 318 mm (12.5 in), occurring over the course of 25 days.

September Precipitation Trends in Cacheu

The chart displays monthly precipitation patterns in Cacheu, 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 Cacheu, September typically receives around 318 mm (12.5 inches) of precipitation spread over approximately 25 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 Cacheu

In Cacheu in September humidity is 84%. With an average temperature of 27°C (82°F), this humidity feels like walking through a warm, damp blanket, making travel feel heavier and more exhausting.

September Average Humidity in Cacheu

This chart illustrates the average monthly humidity levels in Cacheu, 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 Cacheu is approximately 84%, 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 Cacheu

In Cacheu in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Cacheu, you can check here.

Maximum UV Index Levels in Cacheu for September

The chart shows the monthly maximum UV Index (UVI) for Cacheu 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 Cacheu typically reaches 14, which falls under the extreme exposure category.

Data source: Cacheu 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 Cacheu Compares to Other Months

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

This table compares monthly weather conditions in Cacheu, 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)	0 mm (0.0 inches)	34%	very high
February Weather	27°C (80°F)	0 mm (0.0 inches)	39%	very high
March Weather	27°C (81°F)	0 mm (0.0 inches)	37%	extreme
April Weather	27°C (82°F)	0 mm (0.0 inches)	49%	extreme
May Weather	27°C (81°F)	1 mm (0.0 inches)	58%	extreme
June Weather	28°C (83°F)	47 mm (1.9 inches)	73%	extreme
July Weather	27°C (82°F)	348 mm (13.7 inches)	80%	extreme
August Weather	27°C (81°F)	451 mm (17.8 inches)	85%	extreme
September Weather	27°C (82°F)	318 mm (12.5 inches)	84%	extreme
October Weather	29°C (84°F)	123 mm (4.8 inches)	82%	extreme
November Weather	28°C (83°F)	17 mm (0.7 inches)	70%	very high
December Weather	26°C (80°F)	0 mm (0.0 inches)	49%	very high