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Guinea-Bissau weather in September 2025
Expect 30°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Guinea-Bissau in September. Check more long-term weather averages for Guinea-Bissau in September before you book your next holiday to Guinea-Bissau in 2025/2026.
- 30°C max day temperature
30 - 6 hours of sunshine per day
- 19 days with some rainfall
19 - 23°C min night temperature
23 - 12 hours of daylight per day
12 - High heat & humidity
H - 389 mm of monthly rainfall
389 - 11+ (Extreme) UV index
11 - 28°C sea temperature
28
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Recommended for Guinea-Bissau
The September weather guide for Guinea-Bissau (Bissau) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top Guinea-Bissau destinations
Below are average maximum temperatures at popular countries, regions and places in Guinea-Bissau in September. Select a holiday destination to see more weather parameters.
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Metric (°C / mm) | Imperial (°F / inches)
How hot is it in Guinea-Bissau in September?
Daytime temperatures usually reach 30°C in Bissau, Guinea-Bissau in September with high heat and humidity, falling to 23°C at night.
How sunny is it in Guinea-Bissau in September?
There are normally 6 hours of bright sunshine each day in Bissau, Guinea-Bissau in September - that's 49% of daylight hours.
How warm is the sea around Guinea-Bissau in September?
The average sea temperature around Bissau, Guinea-Bissau in September is 28°C.
Does it rain in Guinea-Bissau in September?
There are usually 19 days with some rain in Bissau, Guinea-Bissau in September and the average monthly rainfall is 389mm.
What is the chance of a hurricane in Guinea-Bissau in September?
On average less than 1 day in September in Bissau, Guinea-Bissau is likely to be affected by the passage of one or more tropical storms.
Guinea-Bissau September sunrise & sunset times
Browse the sunrise and sunset times for Guinea-Bissau in September 2025. Select a month to view Guinea-Bissau sunrise and sunset times for the next 12 months. The Guinea-Bissau sunrise and sunset times shown below are for Bissau.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:52 | 19:12 |
| Monday, 15th September 2025 | 06:52 | 19:03 |
| Tuesday, 30th September 2025 | 06:51 | 18:53 |
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