Bissau Weather in September
September in Bissau brings very high temperatures around 31°C (88°F) during the day, dropping to 25°C (77°F) at night, and as part of the rainy season, heavy rainfall is common.
Rainfall in Bissau in September
Bissau is in the rainy season in September, with rain on around 19 days and an average of 317 mm (12 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
Temperatures in Bissau in September top out at 31°C (88°F) and drop to 25°C (77°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Bissau in September
With about 153 hours of sunshine, the area enjoys a nice balance of sun and rainy moments, creating a pleasant environment.
Average water temperature in September
The water is 27°C (81°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.September in Bissau has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations 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 Mali, check out our Bissau's climate page.
Bissau Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Water Temperature
27°C (81°F)
Chance of Rain
63%
Precipitation
317 mm (12 in)
Rainy days
19 days
Humidity
81%
Sunshine
153 hours
Percentage Sunshine
42%
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
Based on 19 years of weather observations in Bissau between 2006 and 2025, these are the recorded extremes.
- Bissau recorded its highest September temperature of 35°C (95°F) on September 22, 2023.
- The lowest daytime temperature in September was 25°C (77°F), recorded on September 7, 2018.
- The coldest night in September in Bissau was on September 14, 2016, with a minimum of 21°C (70°F).
- The heaviest September precipitation occurred on September 6, 2010, when 125 mm (4.9 in) of precipitation fell.
Best Places in Mali in September
Find out more about the weather in Mali and which places have the best travel conditions in this month. See all of Mali in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Bissau in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. The water temperature sits at about 27°C (81°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Sunglasses could come in handy during the sunnier parts of your trip.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 Mali, check out our Bissau's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Bissau climate overview or explore weather in Mali.
