Bissau is rarely comfortable to be outside at midday. It comes closest in early January, and even then it is too hot. For sun, aim for mid December to early March.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go from mid December to early March. It peaks in late January, at 70. Avoid October for this: it falls to 10, mostly because it is too hot. The clearest skies come in March, when the sky is typically 52% covered at midday (partly cloudy).
Bissau never quite rates Good for being outside. It comes closest in early January, at 38, mostly because it is too hot. The weakest stretch is from September to November, when it drops to 0, mostly because it is too hot.
Walking is not what Bissau is for: the Active outdoors rating tops out at 9, mostly because it is too warm.
The year, measured
The average temperature in Bissau over the whole year is 27°C. April is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 20°C. The rainy (wet) season in Bissau runs from July to October, peaking in September with a 78% chance of rain on a given day. The dry season is November to June; February is the driest month, at 0%. Winds in Bissau are highest in April, averaging 2.4 m/s (9 km/h), and lightest in November, at 1.7 m/s (6 km/h). The prevailing wind is from the NW. The clearest skies in Bissau come in March, when the sky is typically 38% covered; August is the cloudiest month, at 72%.
Month by month Bissau climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°C | 20°C | 29°C | 1% | 45% | 2.3 m/s | 34 | 66 | 6 |
| February | 32°C | 21°C | 30°C | 0% | 39% | 2.3 m/s | 23 | 63 | 4 |
| March | 33°C | 22°C | 33°C | 1% | 38% | 2.3 m/s | 5 | 52 | 1 |
| April | 33°C | 24°C | 34°C | 4% | 41% | 2.4 m/s | 1 | 32 | 0 |
| May | 33°C | 25°C | 35°C | 3% | 46% | 2.4 m/s | 1 | 29 | 0 |
| June | 31°C | 26°C | 35°C | 38% | 58% | 2.4 m/s | 2 | 24 | 0 |
| July | 29°C | 25°C | 33°C | 61% | 70% | 2.1 m/s | 2 | 32 | 0 |
| August | 29°C | 25°C | 33°C | 65% | 72% | 2.1 m/s | 4 | 34 | 1 |
| September | 30°C | 25°C | 34°C | 78% | 67% | 1.9 m/s | 2 | 28 | 0 |
| October | 31°C | 26°C | 36°C | 66% | 57% | 1.8 m/s | 0 | 12 | 0 |
| November | 32°C | 24°C | 34°C | 33% | 45% | 1.7 m/s | 2 | 31 | 0 |
| December | 31°C | 21°C | 30°C | 2% | 39% | 2.0 m/s | 23 | 58 | 5 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Bissau weather by season
Year round, Bissau has days of about 29°C at their warmest in August, its coolest month, and 33°C in April, its warmest; the coolest hours of the day run from 20°C to 26°C through the year, and the average temperature over the year is 27°C around the clock. Rain is most likely around September and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Bissau weather in winterDecember to February
Winter in Bissau has typical daily highs of about 31°C and lows of about 21°C, with a 1% chance of rain on a given day.
Bissau weather in springMarch to May
Spring in Bissau has typical daily highs of about 33°C and lows of about 24°C, with a 3% chance of rain on a given day.
Bissau weather in summerJune to August
Summer in Bissau has typical daily highs of about 30°C and lows of about 25°C, with a 55% chance of rain on a given day.
Bissau weather in autumnSeptember to November
Autumn in Bissau has typical daily highs of about 31°C and lows of about 25°C, with a 59% chance of rain on a given day.
When is the rainy season in Bissau?
The rainy (wet) season in Bissau runs from July to October, peaking in September with a 78% chance of rain on a given day. The dry season is November to June; February is the driest month, at 0%.
What time of year is Bissau windiest?
Winds in Bissau are highest in April, averaging 2.4 m/s (9 km/h), and lightest in November, at 1.7 m/s (6 km/h). The prevailing wind is from the NW.
What is the average temperature in Bissau year round?
The average temperature in Bissau over the whole year is 27°C. April is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 20°C.
Where to go instead in early October, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.