Bacabal weather in December

In December, Bacabal sees average daytime highs of 34°C and overnight lows near 24°C, with 131 mm of rain across 15.4 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 34°C in the first days to 33°C by the end. The sky is clear or mostly clear about 15% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of December to 12 h 12 min by month's end. Set against the rest of the year, December is Bacabal's 8th-clearest and 6th-windiest month. For the whole year in context, see Bacabal's year-round climate.

Daytime high
34°
5th warmest
Overnight low
24°
10th coldest
Rainfall
131 mm
15.4 wet days
Daylight
12 h 12 min
5:48 AM – 6:03 PM
Cloud cover
70%
8th clearest
Wind
7 km/h
6th windiest
Solar energy
5.39 kWh/m²
Travel score
2.7
out of 10

Bacabal is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 34°C in the first days to 33°C by the end.

A typical December day in Bacabal reaches about 34°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, December runs about 1°C cooler than November and about 2°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13425
23425
33425
43425
53425
63425
73425
83425
93425
103425
113425
123425
133425
143425
153425
163425
173424
183424
193424
203324
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324
313324

How December really feels in Bacabal

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
7 feel dangerously hot (≥ 39°C)
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.

Bacabal weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°24925.212.22.6
Feb31° / 23°2672512.12.5
Mar31° / 23°31629.1122.5
Apr31° / 24°26526.711.92.6
May31° / 24°13018.511.83.5
Jun32° / 23°357.311.84.5
Jul33° / 23°15311.84.4
Aug34° / 23°51.111.93.7
Sep35° / 24°71.3123.0
Oct36° / 25°173.412.12.6
Nov35° / 25°518.212.22.6
Dec34° / 24°13115.412.22.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24357
34357
44357
54357
64159
74060
84060
94060
103961
113961
123862
133763
143664
153565
163565
173367
183268
193070
203070
212971
222872
232872
242773
252674
262674
272575
282476
292575
302476
312377

Chance of precipitation in December

Any precipitation

Bacabal gets around 131 mm of rain over 15.4 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 50% and peaks near 70% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
133
234
334
434
535
636
737
838
939
1041
1142
1244
1345
1447
1548
1650
1752
1853
1955
2056
2158
2259
2361
2462
2563
2665
2766
2867
2968
3069
3170

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 75% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
1147610
2147610
3147610
4137710
5137710
6127810
7127810
8117910
9117910
10108010
1198011
1298011
1388012
1478013
1578013
1668014
1767816
1857817
1957718
2047620
2147521
2247323
2347224
2437126
2537027
2636928
2736730
2836631
2936631
3036532
3136433

Wind in December

Winds average 7 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 5:42 AM to 5:55 AM, and sunset from 5:56 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:425:56
212.25:425:56
312.25:435:57
412.25:435:57
512.25:435:57
612.25:445:58
712.25:445:58
812.25:455:59
912.25:455:59
1012.25:456:00
1112.25:466:00
1212.25:466:01
1312.25:476:01
1412.25:476:02
1512.25:486:02
1612.25:486:03
1712.25:486:03
1812.25:496:04
1912.25:496:04
2012.25:506:05
2112.25:506:05
2212.25:516:05
2312.25:516:06
2412.25:526:06
2512.25:526:07
2612.25:536:07
2712.25:536:08
2812.25:546:08
2912.25:546:09
3012.25:556:09
3112.25:556:10

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.39 kWh/m².

For context, solar energy here swings from a low near 4.36 kWh/m² to a high of 6.3 kWh/m² in October across the year — December's 5.39 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.4Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in December

Hazard calendar for Bacabal

In seasonPeak

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

Bacabal's monsoon runs January–April, when most of the year's rain falls.

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

Is December a good time to visit Bacabal?

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

2.7
Sightseeing
6th-best month of the year
5.1
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Bacabal.

What to pack for Bacabal in December

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

In December, Bacabal sees daytime highs around 34°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Bacabal in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bacabal peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Bacabal 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 Bacabal is worst in November — around 27 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (June, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1426 µg/m³Jun 189 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar14Moderate
Apr13Moderate
May11Good
Jun9Good
Jul10Good
Aug10Good
Sep13Moderate
Oct22Moderate
Nov27Moderate
Dec20Moderate
Location & terrain

Where is Bacabal?

Bacabal sits at 4.2°S, 44.8°W, 24 m above sea level, in Brazil. The nearest listed city is São Luís Gonzaga do Maranhão, 20 km away.

Topography around Bacabal

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

Within 3 km, the terrain around Bacabal has only modest variations in elevation — a maximum elevation change of 26 m around an average of 20 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, significant variations in elevation — a maximum elevation change of 260 m.

The land around Bacabal is covered by grassland (47%) and artificial surfaces (29%) within 3 km, grassland (71%) and trees (22%) within 16 km, and grassland (56%) and trees (39%) within 80 km.

3 km
26 m
16 km
100 m
80 km
260 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetland
December weather nearby: São Luís Gonzaga do Maranhão 20 km · Alto Alegre do Maranhão 37 km · Olho d’Água das Cunhãs 39 km · São Mateus do Maranhão 40 km · Trizidela do Vale 42 km · Pedreiras 43 km · Vitorino Freire 52 km · Peritoró 52 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 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 Bacabal (-4.2325°, -44.7816°, elevation 24 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. 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).