Bissau Weather in September
September in Bissau brings very high temperatures, with highs of 31°C (88°F) and nights dropping to 25°C (77°F). The rainy season is in full swing this month, so frequent downpours are part of the picture.
Rainfall in Bissau in September
Bissau is in the rainy season in September, with rain on around 19 days and an average of 321 mm (13 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.
Temperature in Bissau in September
September in Bissau sees highs of 31°C (88°F) and lows of 25°C (77°F) overnight. Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Bissau in September
The area enjoys a moderate level of sunlight, with around 180 hours. It's a good balance between sunny and rainy days.September in Bissau has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Guinea-Bissau, check out our Bissau's climate page.
Bissau Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
63%
Precipitation
321 mm (13 in)
Rainy days
19 days
Sunshine
180 hours
Percentage Sunshine
Historical weather for Bissau in September
Browse day-by-day weather records for Bissau spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Bissau historical weather extremes in September
The extremes listed below come from historical weather data collected in Bissau from 2006 through 2025.
- On September 22, 2023, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- On September 7, 2018, Bissau saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in September was 19°C (66°F) (September 16, 2010).
- The heaviest September precipitation occurred on September 3, 2009, when 133 mm (5.2 in) of precipitation fell.
Best Places in Guinea-Bissau in September
Find out more about the weather in Guinea-Bissau and which places have the best travel conditions in this month. See all of Guinea-Bissau in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Bissau in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Bissau in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Guinea-Bissau, check out our Bissau's climate page.
See the full Bissau climate overview or explore weather in Guinea-Bissau.
