September · Equatorial Guinea
Best time to visit Bioko in September Weather, crowds & prices
Weather in Bioko in September
Average temperature 18°C, 453 mm of rain, about 12 days with 6+ hours of sunshine and 97% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.1/10
Ranked #12 of 12 months
- Avg temp
- 18°C
- Rainfall
- 453 mm
- Humidity
- 97%
- Days with 6h+ sun
- 12
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Bioko scores 4.1/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 18°C, 453 mm of rain, and roughly 12 days with 6+ hours of sunshine this month.
Bioko is Equatorial Guinea's volcanic island, rising from the Gulf of Guinea through rainforest, black-sand coast, crater lakes, and protected mountain habitat.
September in Bioko: expect compromises
September averages 18°C (65°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
453 mm of rain puts this in monsoon territory — about 12 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 4.1/10 here, 12th of 12 months, against 8/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? January scores 3.9 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Bioko in September?
- In September, Bioko averages 18°C, 453 mm of rain, and about 12 days with 6+ hours of sunshine. Its climate-comfort score is 4.1/10.
- Is September a good time to visit Bioko?
- September earns a 4.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Bioko in September?
- Expect about 453 mm of rain in September. Average humidity is 97% and there are about 12 days with 6+ hours of sunshine.
Curated in Bioko
Tickets & experiences
Things to do in Bioko
Bioko, Equatorial Guinea. Live activities and tours from GetYourGuide, matched to this destination.