Alcântara weather in December

In December, Alcântara sees average daytime highs of 30°C and overnight lows near 26°C, with 58 mm of rain across 12.6 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 30% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of December to 12 h 06 min by month's end. Set against the rest of the year, December is Alcântara's 7th-clearest and 4th-windiest month. For the whole year in context, see Alcântara's year-round climate.

Daytime high
30°
4th warmest
Overnight low
26°
10th coldest
Rainfall
58 mm
12.6 wet days
Daylight
12 h 06 min
5:50 AM – 5:58 PM
Cloud cover
59%
7th clearest
Wind
15 km/h
4th windiest
Solar energy
5.67 kWh/m²
Travel score
4.5
out of 10

Alcântara is town in Maranhao, Brazil.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical December day in Alcântara reaches about 30°C in the afternoon and slips back to 26°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 31°C. Set against its neighbours, December runs on par with November and about 1°C warmer than January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13126
23126
33126
43126
53126
63126
73126
83126
93126
103126
113126
123126
133126
143126
153126
163126
173026
183026
193026
203026
213026
223025
233025
243025
253025
263025
273025
283025
293025
303025
313025

How December really feels in Alcântara

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.

Alcântara weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 25°18824.212.13.4
Feb29° / 25°26025.812.13.1
Mar29° / 24°39130.3122.9
Apr29° / 25°37628.711.93.0
May29° / 25°26526.511.93.3
Jun29° / 25°12920.811.94.0
Jul30° / 25°8317.111.94.7
Aug30° / 25°236.811.95.5
Sep31° / 26°112.2125.8
Oct31° / 26°122.712.15.7
Nov31° / 26°214.912.15.3
Dec30° / 26°5812.612.14.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25743
35743
45743
55644
65743
75644
85644
95644
105545
115446
125446
135347
145248
155149
165050
174951
184753
194654
204654
214555
224456
234258
244258
254159
264159
274060
283862
293862
303862
313763

Chance of precipitation in December

Any precipitation

Alcântara gets around 58 mm of rain over 12.6 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 41% and peaks near 63% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
121
222
323
423
524
625
726
828
929
1031
1132
1234
1335
1437
1539
1641
1743
1845
1947
2048
2150
2251
2353
2454
2556
2657
2758
2860
2961
3062
3163

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 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1964
2964
3964
4964
5955
6955
7955
8955
9955
10955
11955
12955
13955
14946
15946
16937
17937
18928
19928
20919
21919
229010
239010
249010
258911
268911
278911
288812
298812
308812
318812

Wind in December

Winds average 15 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 06 min at the start of December to 12 h 06 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 5:44 AM to 5:57 AM, and sunset from 5:51 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:445:51
212.15:445:52
312.15:445:52
412.15:455:53
512.15:455:53
612.15:455:53
712.15:465:54
812.15:465:54
912.15:475:55
1012.15:475:55
1112.15:475:56
1212.15:485:56
1312.15:485:57
1412.15:495:57
1512.15:495:58
1612.15:505:58
1712.15:505:58
1812.15:515:59
1912.15:515:59
2012.15:526:00
2112.15:526:00
2212.15:526:01
2312.15:536:01
2412.15:536:02
2512.15:546:02
2612.15:546:03
2712.15:556:03
2812.15:556:04
2912.15:566:04
3012.15:566:04
3112.15:576:05

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.67 kWh/m².

For context, solar energy here swings from a low near 4.43 kWh/m² to a high of 6.31 kWh/m² in October across the year — December's 5.67 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.3Bright
Planning a trip in December

Hazard calendar for Alcântara

In seasonPeak

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

Alcântara's monsoon runs January–May, 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 Alcântara?

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

4.5
Sightseeing
6th-best month of the year
6.3
Beach & pool
5th-best month of the year

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

What to pack for Alcântara in December

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

In December, Alcântara sees daytime highs around 30°C and nights near 26°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

Sea temperature near Alcântara in December

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

The sea offshore is warmest in May at about 29°C and coldest in October near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar28Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Warm
Oct28Warm
Nov28Warm
Dec28Tropical

UV index in Alcântara in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Alcântara peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Alcântara 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 Alcântara is worst in February — around 18 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (July, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodFeb 2018 µg/m³Jul 157 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb18Moderate
Mar18Moderate
Apr13Moderate
May8Good
Jun7Good
Jul7Good
Aug8Good
Sep9Good
Oct10Good
Nov10Good
Dec11Good
Location & terrain

Where is Alcântara?

Alcântara sits at 2.4°S, 44.4°W, 32 m above sea level, in Brazil. The nearest listed city is São Luís, 19 km away.

Topography around Alcântara

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

Within 3 km, the terrain around Alcântara has only modest variations in elevation — a maximum elevation change of 58 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, only modest variations in elevation — a maximum elevation change of 102 m.

The land around Alcântara is covered by water (35%), trees (29%) and mangroves (27%) within 3 km, water (53%) and trees (33%) within 16 km, and water (38%) and trees (35%) within 80 km.

3 km
58 m
16 km
64 m
80 km
102 m
treesgrasslandartificial surfaceswaterwetlandmangroves
December weather nearby: São Luís 19 km · Raposa 35 km · Paço do Lumiar 37 km · Bequimão 41 km · São José de Ribamar 43 km · São Bento 55 km · Icatu 57 km · Palmeirândia 60 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 Alcântara (-2.4041°, -44.4167°, elevation 32 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. 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).