Climate Overview
The climate in Bissau is hot. The average annual temperature is 28°C and approximately 1630mm of precipitation falls per year. August is the wettest month, receiving around 537mm of rainfall. Bissau is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: March, April, February. The coldest months are January, December, February, when temperatures can drop to 21°C.
Temperature
Bissau sees moderate temperature variation throughout the year, ranging from 21°C to 36°C. March is the hottest month, with daytime highs reaching 36°C and an average of 28°C. January is the coolest month, with minimum temperatures around 21°C and an average of 27°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs.
Precipitation
Bissau is a fairly wet location, receiving approximately 1630mm of precipitation annually, which averages out to around 136mm per month. The wettest month is August, averaging 537mm of rainfall. July and September also tend to see above-average precipitation. The driest month is March, with just 0mm. That's 537mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Bissau is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Bissau, which began on September 23, 2026. Bissau is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in March at around 36°C, while the coldest stretch bottoms out in January near 21°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 23 to 36°C. Precipitation is minimal, with only around 4mm for the entire season. Winds are generally light, averaging 11km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.
Summer
Temperatures range from 25 to 32°C. Rainfall is heavy, totalling around 1053mm across the season with a monthly average of 351mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 33°C. Rainfall is heavy, totalling around 573mm across the season with a monthly average of 191mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 35°C. Precipitation is minimal, with only around 0mm for the entire season. Winds are generally light, averaging 10km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Bissau based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
