September · Guinea-Bissau
Best time to visit Bissau in September Weather, crowds & prices
Weather in Bissau in September
Average temperature 26°C, 334 mm of rain, about 23 days with 6+ hours of sunshine and 87% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.3/10
Ranked #12 of 12 months
- Avg temp
- 26°C
- Rainfall
- 334 mm
- Humidity
- 87%
- Days with 6h+ sun
- 23
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Bissau scores 3.3/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 26°C, 334 mm of rain, and roughly 23 days with 6+ hours of sunshine this month.
Bissau is Guinea-Bissau's low-rise capital, with Portuguese-era streets, markets, a working port, cashew culture, and access to the Bijagós archipelago.
September in Bissau — off-season conditions
Days in September average 26°C (79°F) and humidity near 87% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 334 mm, but with about 23 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3.3/10 on the same scale — 12th of 12 months, versus 8.6/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, December is materially better in Bissau — 5.3 points higher on the same scale.
Frequently asked
- What is the weather like in Bissau in September?
- In September, Bissau averages 26°C, 334 mm of rain, and about 23 days with 6+ hours of sunshine. Its climate-comfort score is 3.3/10.
- Is September a good time to visit Bissau?
- September earns a 3.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Bissau in September?
- Expect about 334 mm of rain in September. Average humidity is 87% and there are about 23 days with 6+ hours of sunshine.
Curated in Bissau
Tickets & experiences
Things to do in Bissau
Bissau, Guinea-Bissau. Live activities and tours from GetYourGuide, matched to this destination.