Belem weather in August

In August, Belem sees average daytime highs of 29°C and overnight lows near 25°C, with 452 mm of rain across 29.3 wet days and about 12.4 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 0% of the time in August, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of August to 12 h 12 min by month's end. Set against the rest of the year, August is Belem's 12th-clearest and 6th-windiest month. For the whole year in context, see Belem's year-round climate.

Daytime high
29°
12th warmest
Overnight low
25°
8th coldest
Rainfall
452 mm
29.3 wet days
Daylight
12 h 24 min
6:55 AM – 7:18 PM
Cloud cover
86%
12th clearest
Wind
10 km/h
6th windiest
Solar energy
4.14 kWh/m²
Travel score
2.9
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical August day in Belem reaches about 29°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, August runs on par with July and about 1°C cooler than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262925
272924
282924
292924
302924
312924

How August really feels in Belem

Once humidity and wind are folded in, August averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Belem weather by month

How August compares with the rest of the year at a glance. August is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 21°00.111.44.4
Feb34° / 22°10.111.63.6
Mar35° / 23°0011.93.3
Apr35° / 24°0012.33.6
May33° / 25°61.312.54.1
Jun32° / 26°871212.73.8
Jul30° / 25°35227.812.63.0
Aug29° / 25°45229.312.42.9
Sep30° / 25°30727.712.12.8
Oct31° / 25°1422211.73.2
Nov33° / 24°234.611.54.2
Dec33° / 22°20.311.34.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in August, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of August, with mostly cloudy or overcast conditions the remaining 92%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11892
12793
13793
14793
15793
16793
17793
18793
19793
20793
21694
22694
23694
24793
25793
26793
27793
28793
29892
30892
31892

Chance of precipitation in August

Any precipitation

Belem gets around 452 mm of rain over 29.3 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 94% and peaks near 95% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
193
293
393
493
593
693
794
894
994
1094
1194
1295
1395
1495
1595
1695
1795
1895
1995
2095
2195
2295
2395
2495
2595
2695
2795
2895
2995
3095
3195

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the miserable band about 64% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13763
23763
33664
43664
53664
63565
73565
83565
93565
103565
113565
123565
133664
143664
153664
163664
173664
183763
193763
203763
213763
223763
233763
243763
253664
263664
273664
283664
293565
303565
313565

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 30 min at the start of August to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over August. Sunrise moves from 6:53 AM to 6:55 AM, and sunset from 7:24 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:537:24
212.56:537:24
312.56:537:24
412.56:537:23
512.56:537:23
612.56:537:23
712.56:547:22
812.56:547:22
912.56:547:22
1012.56:547:21
1112.46:547:21
1212.46:547:20
1312.46:547:20
1412.46:547:19
1512.46:557:19
1612.46:557:18
1712.46:557:18
1812.46:557:17
1912.46:557:17
2012.46:557:16
2112.36:557:16
2212.36:557:15
2312.36:557:15
2412.36:557:14
2512.36:557:13
2612.36:557:13
2712.36:557:12
2812.36:557:12
2912.36:557:11
3012.36:557:10
3112.26:557:10

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.14 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.14 kWh/m² to a high of 7.03 kWh/m² in April across the year — August's 4.14 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
314.1Bright
Planning a trip in August

Hazard calendar for Belem

In seasonPeak

In August, Belem sits inside its atlantic hurricane and monsoon season. The full year is below, with each hazard's peak months called out.

Belem sits in the Atlantic hurricane belt; the season peaks August–October.

Belem's monsoon runs July–September, when most of the year's rain falls.

Belem sees seasonal dust haze (February–June), heaviest in June.

Atlantic hurricane
Monsoon
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Belem?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.9
Sightseeing
11th-best month of the year
3.8
Beach & pool
12th-best month of the year

August is a weaker month for outdoor sightseeing in Belem.

What to pack for Belem in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Belem sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Belem in August

The nearest coast averages about 28°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 26 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.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar26Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul28Tropical
Aug28Warm
Sep28Tropical
Oct29Tropical
Nov29Tropical
Dec27Warm

UV index in Belem in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Belem 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 18UV 13Dec 20UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec7Very high

Air quality in Belem in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Belem 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).

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorFeb 1884 µg/m³Aug 2116 µg/m³
PM2.5 (µg/m³)Level
Jan63Unhealthy
Feb86Unhealthy
Mar76Unhealthy
Apr51Poor
May53Poor
Jun50Poor
Jul24Moderate
Aug16Moderate
Sep18Moderate
Oct35Moderate
Nov45Poor
Dec58Unhealthy
Location & terrain

Where is Belem?

Belem sits at 11.9°N, 15.6°W, 47 m above sea level, in Guinea-Bissau. The nearest listed city is Reino de Bandim, 0.0 km away.

Topography around Belem

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Belem.

Within 3 km, the terrain around Belem has only modest variations in elevation — a maximum elevation change of 43 m around an average of 13 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 Belem is covered by artificial surfaces (58%) within 3 km, water (45%) within 16 km, and trees (40%) and water (33%) within 80 km.

3 km
43 m
16 km
48 m
80 km
61 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
August weather nearby: Reino de Bandim 0.0 km · Missira 1.0 km · Sintra-Nema 1.0 km · Bissau 1.0 km · Contumo 2.0 km · Bairro Militar 3.0 km · Luanda 3.0 km · Quelele 4.0 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
Muslim 46%folk religions 31%Christian 19%other or unaffiliated 4%

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 Belem (11.8534°, -15.603°, elevation 47 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).