Bissau in Summer
In summer (June, July and August), Bissau sees average daytime highs around 30°C and overnight lows near 25°C, with 891 mm of rain over about 69 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Over the season highs ease from about 33°C in early June to 29°C by late August. The sky is clear or mostly clear about 5% of the time across summer, and the air most often feels miserable.
Summer is Bissau's weakest season of the year to visit on our travel score. For the whole year in context, see Bissau's year-round climate.
- Avg daytime high
- 30°C
- coldest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 891 mm
- 69 wet days
- Avg wind
- 11 km/h
- Travel score
- 3.2
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Bissau in Summer
Over the season highs ease from about 33°C in early June to 29°C by late August.
A typical summer day in Bissau reaches about 30°C and drops to 25°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Bissau
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Bissau weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 21° | 0 | 0.1 | 11.4 | 4.4 |
| Feb | 34° / 22° | 1 | 0.1 | 11.6 | 3.6 |
| Mar | 35° / 23° | 0 | 0 | 11.9 | 3.3 |
| Apr | 35° / 24° | 0 | 0 | 12.3 | 3.6 |
| May | 33° / 25° | 6 | 1.3 | 12.5 | 4.1 |
| Jun | 32° / 26° | 87 | 12 | 12.7 | 3.8 |
| Jul | 30° / 25° | 352 | 27.8 | 12.6 | 3.0 |
| Aug | 29° / 25° | 452 | 29.3 | 12.4 | 2.9 |
| Sep | 30° / 25° | 307 | 27.7 | 12.1 | 2.8 |
| Oct | 31° / 25° | 142 | 22 | 11.7 | 3.2 |
| Nov | 33° / 24° | 23 | 4.6 | 11.5 | 4.2 |
| Dec | 33° / 22° | 2 | 0.3 | 11.3 | 4.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 5% of the time across summer.
Chance of precipitation in Summer
Bissau gets around 891 mm of rain over 69 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 36 min in early June to 12 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.6 kWh/m².
Hazard calendar for Bissau
In summer, Bissau overlaps its atlantic hurricane, monsoon and dust season. The full year is below, with each hazard's peak months called out.
Bissau sits in the Atlantic hurricane belt; the season peaks August–October.
Bissau's monsoon runs July–September, when most of the year's rain falls.
Bissau sees seasonal dust haze (February–June), heaviest in June.
Is summer a good time to visit Bissau?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Bissau.
What to pack for Bissau in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Bissau sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 69 days see rain.
Sea temperature near Bissau in Summer
The nearest coast averages about 28°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 27 km away) is warmest in November at about 29°C and coldest in February near 25°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 25 | 25 | 26 | 27 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Warm | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 25 | Warm |
| Feb | 25 | Warm |
| Mar | 26 | Warm |
| Apr | 27 | Warm |
| May | 28 | Warm |
| Jun | 28 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Warm |
| Sep | 28 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 27 | Warm |
UV index in Bissau in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bissau peaks around August 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 7 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 11 | 13 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 9 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 11 | Extreme |
| Mar | 13 | Extreme |
| Apr | 11 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 7 | Very high |
Air quality in Bissau in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Bissau is worst in February — around 86 µg/m³ PM2.5 (unhealthy), about 5.5× the cleanest month (August, 16 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 63 | 86 | 76 | 51 | 53 | 50 | 24 | 16 | 18 | 35 | 45 | 58 |
| Level | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Poor | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 63 | Unhealthy |
| Feb | 86 | Unhealthy |
| Mar | 76 | Unhealthy |
| Apr | 51 | Poor |
| May | 53 | Poor |
| Jun | 50 | Poor |
| Jul | 24 | Moderate |
| Aug | 16 | Moderate |
| Sep | 18 | Moderate |
| Oct | 35 | Moderate |
| Nov | 45 | Poor |
| Dec | 58 | Unhealthy |
Where is Bissau?
Bissau sits at 11.9°N, 15.6°W, 13 m above sea level, in Guinea-Bissau. The nearest listed city is Sintra-Nema, 0.0 km away.
Topography around Bissau
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bissau.
Within 3 km, the terrain around Bissau has only modest variations in elevation — a maximum elevation change of 43 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 48 m; within 80 km, only modest variations in elevation — a maximum elevation change of 61 m.
The land around Bissau is covered by artificial surfaces (63%) within 3 km, water (43%) within 16 km, and trees (41%) and water (32%) within 80 km.
Guinea-Bissau travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type C / E / F
- 220 V · 50 Hz
- Prices
- ≈ 34% of US
- price level, 2025
- GDP per capita
- $1,124
- 2025
- Safe drinking water
- 24%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2017
- Road deaths
- 32.2
- per 100k/yr, 2019
- Income group
- Low
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bissau (11.8636°, -15.5977°, elevation 13 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.