Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Guinea-Bissau Average Monthly Weather
Weather score70Good annual avg
Best months: December, January, February
Across the year, average daytime temperatures are around 32°C, sunshine averages 7h per day, and rainfall totals about 2128mm. Sea temperatures average 27°C across the year.
Annual weather
Annual averages
Temp
32°C
Rain
2128mm
Annual total
Sun
7h
Sea
27°C
Weather score
70
Good avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 670mm, so showers are a real planning factor.
Limited sun
Sunshine averages 4.5h per day, so this is not one of the brighter months.
Warm sea
Sea temperatures average 28°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Guinea-Bissau with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August30°C average high
August is cooler than the yearly average, which can make sightseeing feel gentler than in hotter months.
Warmest monthsFebruary to May
This stretch sets the upper range for average daytime heat.
Rain
August670mm average rain
August is one of Guinea-Bissau's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to June and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August4.5 hours average sun
August is one of Guinea-Bissau's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJanuary to May and November
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August28°C average sea
August is close to Guinea-Bissau's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJuly and October to November
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
August48 weather score
August is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJanuary to May and November to December
These months have the strongest weather score in the monthly averages.