September weather forecast
Guinea-Bissau

September in Guinea-Bissau marks the tail end of the wet season, though high rainfall and warm temperatures persist. The average temperatures range from a comfortable 23°C (73.4°F) during the cooler morning hours to 31°C (87.8°F) at the peak of the day. Although these temperatures mirror those of August, the high humidity levels associated with the significant rainfall can make the climate feel warmer.

In the capital city of Bissau, September experiences similar weather patterns, with temperatures fluctuating between 24°C (75.2°F) and 31°C (87.8°F). Its coastal position moderates the heat slightly, but also contributes to high humidity and substantial rainfall.

The rainfall in September remains considerable, with precipitation levels averaging 300mm (11.81"). While this is a decrease from the peak rainfall levels of August, it's still significant, signifying the gradual retreat of the monsoon season.

Compared to August, September sees similar temperatures but a slight decrease in rainfall. The heavy rains continue to nourish the lush and vibrant landscape across the country, making this period visually spectacular, albeit challenging for travel. With the wet season drawing to a close, late September can offer opportunities for exploration before the dry season sets in, providing visitors with a chance to witness the country's rich biodiversity and verdant landscapes.

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• Bissau - September »
  On the first day of September sunrise is at 06:52 and sunset at 19:12. In Bissau in September, during 19 rainfall days, 435mm (17.13") of precipitation is typically accumulated.
• Gabu - September »
  On the first day of September in Gabu, sunrise is at 06:46 and sunset at 19:07. In Gabu, during September, the rain falls for 17 days and regularly aggregates up to 343mm (13.5") of precipitation.
• Canchungo - September »
  In Canchungo in September, it is raining for 20.5 days, with typically 133mm (5.24") of accumulated precipitation. The average heat index, which combines relative humidity and air temperature, in September is appraised at 41°C (105.8°F).
• Bissora - September »
  In Bissora during September, the rain falls for 24.5 days and regularly aggregates up to 153mm (6.02") of precipitation. August and September, with an average relative humidity of 84%, are most humid months in Bissora.
• Bolama - September »
  In Bolama during September, the rain falls for 20.7 days and regularly aggregates up to 132mm (5.2") of precipitation. In Bolama the average relative humidity in September is 81%.
• Cacheu - September »
  The months with the highest UV index in Cacheu are January through June, September through December, with an average maximum UV index of 7. In Cacheu, during September, the rain falls for 20.5 days and regularly aggregates up to 133mm (5.24") of precipitation.
• Buba - September »
  August and September, with an average relative humidity of 85%, are most humid months in Buba, Guinea-Bissau. The months with the highest UV index in Buba are January through July, September through December, with an average maximum UV index of 7.
• Catió - September »
  In Catió during September, the rain falls for 22.2 days and regularly aggregates up to 168mm (6.61") of precipitation. August and September, with an average relative humidity of 85%, are most humid months in Catió, Guinea-Bissau.
• Quebo - September »
  August and September, with an average relative humidity of 85%, are most humid months in Quebo, Guinea-Bissau. On the first day of September in Quebo, Guinea-Bissau, sunrise is at 06:49 and sunset at 19:09.
• Fulacunda - September »
  August and September, with an average relative humidity of 85%, are most humid months in Fulacunda, Guinea-Bissau. The months with the highest humidity in Fulacunda are August and September, with an average relative humidity of 85%.
• Farim - September »
  As August transitions into September, the average high-temperature in Farim rests at a still hot 31.7°C (89.1°F), maintaining a close resemblance to the previous month. In Farim, in September, during 23.9 rainfall days, 145mm (5.71") of precipitation is typically accumulated.