Guinea-Bissau (Bissau)
September
Weather in Guinea-Bissau for September 2026
Your guide to Guinea-Bissau weather in September - trends and predictions
So far, September 2026 in Guinea-Bissau shows a warmer trend than usual by 2.3 °C.
The forecast for the next days in Guinea-Bissau predicts temperatures to be around 28 °C, close to the historical average.
In general, the average temperature in Guinea-Bissau at the beginning of September is 28.6 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 29.1 °C by the end of September.
Guinea-Bissau experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 459.3 mm.
Temperatures
Rain 🌧️
1
Dry days
29
Rainy days
0
Snow days
28°/24°
Temperatures
17 km/h
Avg max wind
84 %
Avg humidity
Guinea-Bissau Weather September
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What’s the Weather Like in Guinea-Bissau This September?
Discover the average temperatures and weather trends across Guinea-Bissau’s cities this September.
Temperatures trend during September in Guinea-Bissau
See the weather trend as well as the moving average line
September weather in Guinea-Bissau day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate or heavy rain shower | 27° /23° | 21.1 mm | 7 | |
| 2 Sept. |  Light rain shower | 29° /24° | 10.1 mm | 6 | |
| 3 Sept. | Light rain shower | 29° /24° | 8.8 mm | 5 | |
| 4 Sept. |  Torrential rain shower | 29° /23° | 24.4 mm | 5 | |
| 5 Sept. | Light rain shower | 29° /24° | 11.1 mm | 5 | |
| 6 Sept. | Light rain shower | 29° /24° | 23.6 mm | 5 | |
| 7 Sept. | Light rain shower | 28° /24° | 15 mm | 6 | |
| 8 Sept. | Light rain shower | 29° /23° | 12.2 mm | 5 | |
| 9 Sept. | Light rain shower | 28° /23° | 18.2 mm | 5 | |
| 10 Sept. | Patchy rain possible | 28° /23° | 26 mm | 5 | |
| 11 Sept. | Moderate or heavy rain shower | 29° /24° | 13.1 mm | 5 | |
| 12 Sept. | Light rain shower | 29° /24° | 5.8 mm | 6 | |
| 13 Sept. | Moderate rain at times | 29° /24° | 6.5 mm | 6 | |
| 14 Sept. | Light rain shower | 30° /26° | 7.4 mm | 6.4 | |
| 15 Sept. | Light rain shower | 30° /26° | 4.3 mm | 7.9 | |
| 16 Sept. |  Overcast | 28° /27° | 0.2 mm | 9.7 | |
| 17 Sept. | Patchy rain possible | 28° /28° | 2.2 mm | 8.9 | |
| 18 Sept. | Light rain shower | 29° /27° | 7.3 mm | 7 | |
| 19 Sept. | Patchy rain possible | 28° /26° | 0.3 mm | 6 | |
| 20 Sept. | Overcast | 28° /27° | 1.4 mm | 6 | |
| 21 Sept. | Patchy rain possible | 28° /26° | 2.8 mm | 6 | |
| 22 Sept. | Overcast | 27° /25° | 33.8 mm | 6 | |
| 23 Sept. | Overcast | 28° /25° | 1.2 mm | 6 | |
| 24 Sept. | Patchy rain possible | 29° /27° | 12.6 mm | 6 | |
| 25 Sept. | Light rain shower | 28° /25° | 35.2 mm | 6 | |
| 26 Sept. | Light rain shower | 28° /25° | 8.3 mm | 6 | |
| 27 Sept. | Moderate or heavy rain shower | 30° /25° | 6.7 mm | 6 | |
| 28 Sept. |  Thundery outbreaks possible | 30° /24° | 2.8 mm | 7 | |
| 29 Sept. | Thundery outbreaks possible | 30° /25° | 4.4 mm | 7 | |
| 30 Sept. |  Patchy light rain with thunder | 29° /25° | 9.7 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Guinea-Bissau in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Guinea-Bissau forecast closer to your planned date for the most up-to-date weather information.
Change Month
Guinea-Bissau in September - FAQ
What are the expected maximum and minimum temperatures in Guinea-Bissau during September?
During September, expect a variety of temperatures with highs around 28° and lows near 24°, suitable for diverse activities and preferences.
How much rainfall should be expected in Guinea-Bissau during September?
Significant rainfall exceeding 459.3 mm is expected in Guinea-Bissau during September, occurring over more than 29 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Guinea-Bissau during September?
The average wind speed in Guinea-Bissau during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Guinea-Bissau
Explore the daily rainfall trends and prepare for Guinea-Bissaus September weather 💧
Typically, Guinea-Bissau has 29 rainy days in September with a total of 459.3 mm of rainfall.
UV exposure in Guinea-Bissau during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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