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 maximum daytime temperature in September in Guinea-Bissau (Bissau)30
    30°C max day temperature
  • 6 hours of sunshine per day
  • 19 days with some rainfall in September in Guinea-Bissau (Bissau)19
    19 days with some rainfall
  • 23°C minimum night-time temperature in September in Guinea-Bissau (Bissau)23
    23°C min night temperature
  • 12 hours of daylight per day in September in Guinea-Bissau (Bissau)12
    12 hours of daylight per day
  • High heat & humidity in September in Guinea-Bissau (Bissau)H
    High heat & humidity
  • 389 mm monthly rainfall in September in Guinea-Bissau (Bissau)389
    389 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Guinea-Bissau (Bissau)11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Guinea-Bissau (Bissau)28
    28°C sea temperature

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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.

All Guinea-Bissau destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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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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