Belem weather in December

In December, Belem sees average daytime highs of 33°C and overnight lows near 22°C, with 2 mm of rain across 0.3 wet days and about 11.3 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 49% of the time in December, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of December to 11 h 18 min by month's end. Set against the rest of the year, December is Belem's 6th-clearest and 9th-windiest month. For the whole year in context, see Belem's year-round climate.

Daytime high
33°
6th warmest
Overnight low
22°
3rd coldest
Rainfall
2 mm
0.3 wet days
Daylight
11 h 18 min
7:19 AM – 6:38 PM
Cloud cover
43%
6th clearest
Wind
9 km/h
9th windiest
Solar energy
5.34 kWh/m²
Travel score
4.4
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical December day in Belem reaches about 33°C in the afternoon and slips back to 22°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 35°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13323
23323
33323
43323
53323
63322
73322
83322
93322
103322
113322
123322
133322
143322
153322
163322
173321
183321
193321
203321
213321
223321
233321
243321
253321
263321
273321
283321
293321
303321
313321

How December really feels in Belem

Once humidity and wind are folded in, December 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 December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Belem weather by month

How December compares with the rest of the year at a glance. December is the 6th-warmest and 8th-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 December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 36%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16436
26436
36337
46337
56337
66337
76337
86337
96436
106436
116436
126337
136337
146337
156337
166337
176436
186436
196436
206436
216436
226436
236535
246436
256436
266436
276436
286436
296436
306436
316436

Chance of precipitation in December

Any precipitation

Belem gets around 2 mm of rain over 0.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 2% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
12
22
32
42
52
62
72
82
92
102
111
121
131
141
151
161
171
180
190
200
210
220
230
240
250
260
270
280
290
300
310

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
17151626323
28161726303
39181826273
410191825252
512201925222
613211925202
714222024182
815232024172
917232023151
1018242023141
1120242022131
1222242021121
1324241921121
1425241920110
1527241920100
1628241919100
173024191890
183124191890
193323181780
203523181680
213623171680
223822171570
234022171570
244122161470
254222161370
264422151360
274522151260
284622151250
294722151150
304922141140
315121141040

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 24 min at the start of December to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:12 AM to 7:26 AM, and sunset from 6:33 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:126:33
211.37:126:33
311.37:136:33
411.37:136:34
511.37:146:34
611.37:146:34
711.37:156:34
811.37:156:35
911.37:166:35
1011.37:166:35
1111.37:176:36
1211.37:176:36
1311.37:186:37
1411.37:186:37
1511.37:196:37
1611.37:196:38
1711.37:206:38
1811.37:206:39
1911.37:216:39
2011.37:216:40
2111.37:226:40
2211.37:226:40
2311.37:236:41
2411.37:236:41
2511.37:246:42
2611.37:246:42
2711.37:256:43
2811.37:256:43
2911.37:256:44
3011.37:266:44
3111.37:266:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.34 kWh/m².

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 — December's 5.34 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in December

Hazard calendar for Belem

In seasonPeak

None of Belem's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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 December a good time to visit Belem?

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

4.4
Sightseeing
1st-best month of the year
7.8
Beach & pool
2nd-best month of the year

December is a reasonable time to visit Belem for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Belem in December

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

In December, Belem sees daytime highs around 33°C and nights near 22°C. Pack light clothes. Worth having: sun protection.

light clothessun protection

Sea temperature near Belem in December

The nearest coast averages about 27°C in December — 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 December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. 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 December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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
December 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).