Country Overview For Guinea-Bissau
The climate in Guinea-Bissau is typically tropical; generally hot and humid; monsoonal-type rainy season (June to November) with southwesterly winds; dry season (December to May) with northeasterly harmattan winds. The terrain: mostly low coastal plain rising to savanna in east. For Bissau in January the daily average maximum temperatures is 34°C with the average minimum 18°C, while in June the average maximum is 35°C with a minimum of 24°C. The wettest month for Bissau is August with an average of 330.6mm of precipitation falling while the driest month is March with 0.0mm falling.
HISTORICAL MONTHLY AVERAGES FOR DECEMBER
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Farim.
Throughout the month of December daytime temperatures will generally reach highs of around 35°C that's about 95°F. At night the average minimum temperature drops down to around 16°C, that's 60°F.
In recent times the highest recorded temperature in December has been 40°C that's 104°F, with the lowest recorded temperature 8°C, about 46°F.
The average daily relative humidity for December is around 45%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels caution is advised. Fatigue is possible with prolonged exposure and/or physical activity for those in high risk groups of possible heat disorders (see heat index for more information).
The average monthly amount of precipitation has been recorded at around 0 mm, that's 0 inches.
Estimated Hours of Sunshine per Day
We calculate sunshine hours per day using our past forecast data. For December expect the sun to shine for an average of 10 hours per day. This represents the average number of hours in the daytime that the sun is visible and not obscured by cloud e.g. the average number of hours the sun is actually out and shining. Note we calculate hours of sunshine per day using our past forecast data, not observation data, thus it is an estimate and not actual.
The average daily wind speed in December has been around 4 km/h, that’s the equivalent to about 2 mph, or 2 knots. In recent years the maximum sustained wind speed has reached 48 km/h, that’s the equivalent of around 30 mph, or 26 knots.
On average the month of December is not affected by foggy conditions.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average monthly precipitation amount.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.