Climate and monthly weather forecast
Guinea-Bissau

Guinea-Bissau, situated on the west coast of Africa, encompasses a diverse range of landscapes from mangrove-laden swamps to dense rainforests and vast savannas. The country experiences a tropical monsoon climate as per the Köppen climate classification. Its geographical location near the equator ensures high temperatures year-round, typically averaging 26°C (78.8°F), with little variation between months. The coastal regions receive copious rainfall, ranging from 2,0mm (0") to 3,0mm (0") annually, whilst the interior is somewhat drier. The annual rainfall pattern divides the year into a wet season, from June to November, and a dry season, from December to May, dictated by the movement of the Intertropical Convergence Zone.

The optimal time for a trip to Guinea-Bissau is during the dry season, spanning from December to May. During these months, the weather is more predictable, temperatures are relatively cooler, averaging 24°C (75.2°F), and there is limited rainfall, providing favorable conditions for travel and exploration. Visitors in this period can expect clear skies and good road conditions, facilitating access to remote areas and wildlife reserves, such as the Cantanhez Forest National Park.

The period from June to November marks the wet season in Guinea-Bissau and is typically deemed the least suitable time for tourism. Intense rainfall and high humidity can make traveling uncomfortable and potentially risky, due to flooding and deteriorating road conditions. In this season, temperatures hover around a humid 28°C (82.4°F). The heavy rainfall, however, contributes to the flourishing of Guinea-Bissau's rich biodiversity and transforms the landscape into a lush green spectacle.

As Guinea-Bissau is located in the tropics, it does not experience a spring season in the traditional sense. Instead, the country transitions from the dry season into the wet season around March. During this period, temperatures average around 25°C (77°F), and humidity begins to rise. The landscape slowly regains its verdant hues as the first showers begin to fall.

The summer months in Guinea-Bissau, from June to August, are characterized by heavy rains and high temperatures. This period marks the peak of the wet season with precipitation levels reaching up to 500mm (19.69") per month. The average temperature is around 27°C (80.6°F) but can feel much warmer due to the high humidity. Despite the challenging weather conditions, this season brings a flourish of life to the country's natural habitats.

Autumn in Guinea-Bissau, essentially the tail end of the wet season (September to November), sees a gradual decline in rainfall and a slight drop in temperatures. During these months, temperatures average around 26°C (78.8°F), while rainfall reduces to about 300mm (11.81") per month. As the rains recede, the country's landscapes are at their most lush and green.

Winter in Guinea-Bissau, coinciding with the dry season from December to February, experiences relatively cooler temperatures and low precipitation. During this period, temperatures range from 22°C (71.6°F) to 24°C (75.2°F), and monthly rainfall is typically less than 10mm (0.39"). These cooler, drier months provide a respite from the high humidity and heavy rainfall of the wet season.

January in Guinea-Bissau falls within the dry season and is marked by relatively cooler temperatures and minimal rainfall. On average, temperatures fluctuate from a pleasant 19°C (66.2°F) during the night to 31°C (87.8°F) in the daytime. Weather in January »

February marks the continuation of the dry season in Guinea-Bissau, yet it carries the initial hints of the approaching heat. The average temperature begins to rise, varying from 20°C (68°F) in the early morning to 35°C (95°F) in the afternoon. Weather in February »

March in Guinea-Bissau signals a noticeable shift towards warmer temperatures, indicating the impending end of the dry season. During this month, the average low temperature increases to 22°C (71.6°F), while the high climbs to approximately 37°C (98.6°F), significantly warmer than the preceding months of January and February. In Bissau, the nation's capital situated along the Atlantic coast, the climate remains slightly milder. Weather in March »

April is the final full month of the dry season in Guinea-Bissau and serves as a threshold before the onset of the wet season. The average temperatures continue to climb during April, ranging from 23°C (73.4°F) in the cooler parts of the day to 38°C (100.4°F) during peak afternoon heat. Weather in April »

May in Guinea-Bissau marks the transition from the dry season to the wet season. Temperatures continue to rise, averaging between 25°C (77°F) during the cooler morning hours and 39°C (102.2°F) at the peak of the day, making it one of the hottest months of the year. In the coastal regions, including the capital city, Bissau, temperatures are somewhat tempered by the Atlantic Ocean, ranging from 25°C (77°F) to 37°C (98.6°F). Weather in May »

June in Guinea-Bissau signifies the onset of the wet season, characterized by considerable rainfall and persistent high temperatures. The temperatures during June range from 24°C (75.2°F) in the cooler early morning hours to about 33°C (91.4°F) during the day. Weather in June »

July represents the middle of the wet season in Guinea-Bissau and is typically one of the rainiest months of the year. During this month, temperatures vary from 23°C (73.4°F) in the cooler morning hours to approximately 30°C (86°F) in the afternoon. Weather in July »

August in Guinea-Bissau remains squarely within the wet season, characterized by continued high rainfall and persistently warm temperatures. The average temperatures during this month range from 23°C (73.4°F) in the cooler morning hours to approximately 30°C (86°F) in the afternoon. Weather in August »

September in Guinea-Bissau marks the tail end of the wet season, though high rainfall and warm temperatures persist. The average temperatures range from a comfortable 23°C (73.4°F) during the cooler morning hours to 31°C (87.8°F) at the peak of the day. Weather in September »

October in Guinea-Bissau signifies the end of the wet season and the beginning of the transition into the dry season. Temperatures during this month range from 23°C (73.4°F) during the cooler morning hours to about 32°C (89.6°F) at the peak of the day. Weather in October »

November in Guinea-Bissau signals a definitive move into the dry season. Temperatures in November average from 22°C (71.6°F) in the early morning to 33°C (91.4°F) during the warmest part of the day. The drop in humidity levels from the preceding months makes the climate more comfortable, despite the consistent high temperatures. In Bissau, November's temperatures typically fluctuate between 23°C (73.4°F) and 33°C (91.4°F). Weather in November »

December in Guinea-Bissau ushers in a distinct phase of the dry season. The average temperatures range from a pleasant 20°C (68°F) during the cooler morning hours to about 33°C (91.4°F) during the day. Although these temperatures are consistent with November, the further decrease in humidity makes the climate feel more comfortable. In the coastal capital city of Bissau, December experiences similar weather patterns, with temperatures typically varying between 20°C (68°F) and 31°C (87.8°F). Weather in December »