Bissau Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Bissau, Guinea-Bissau. Long-term data from 1990 to 2020 was used to calculate these averages. Now, let's break down all the details for a clearer picture.

Bissau experiences significant rainfall throughout the year, averaging 1398 mm (55 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry and rainy season during certain months. You can clearly see this in our monthly precipitation graphs below.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, August receives substantial rainfall, averaging 460 mm (18 in) of precipitation, recorded across 22 rainy days.

In contrast, the driest month, March brings less rainfall, with 0.1 mm (0 in) over 0 rainy days.

August, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 156 hours of sunshine in this period. During the driest month March you can expect a temperature of 35°C (95°F). For more detailed insights into the city's temperatures, visit our Bissau Temperature page.

Bissau's average annual precipitation is 1398 mm (55 in). Let's compare this to some popular worldwide tourist destinations:

In Toronto, Canada, annual precipitation averages 964 mm (38 in), with snowy winters and rainy summers.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.

Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Bissau's weather, including sunshine hours, humidity levels, and temperature data, visit our Bissau Climate page.