Bissau weather in September
September in Bissau: sweltering, soaked, with clean air — a fair time to visit.
#10 of 12 months in Bissau · #567 of 604 destinations to visit in September · comfort 50/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Bissau climate normals — September
| Daytime high | 29°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 366 mm / 14.4 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Bissau?
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Bissau in September — FAQ
- Is September a good time to visit Bissau?
- September in Bissau: sweltering, soaked, with clean air — a fair time to visit. It ranks #10 of 12 months for Bissau on SeasonMap's comfort score (50/100).
- What is the weather like in Bissau in September?
- In September, Bissau averages a daily high of 29.4°C and a low of 24.6°C, with about 366.3 mm of rain over roughly 27 rainy days.
- What is the air quality in Bissau in September?
- Bissau has a mean US Air Quality Index of about 36 in September.