Açailândia weather in December

In December, Açailândia sees average daytime highs of 31°C and overnight lows near 22°C, with 166 mm of rain across 21.5 wet days and about 12.3 hours of daylight. It is the 7th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 6% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 18 min by month's end. Set against the rest of the year, December is Açailândia's 8th-clearest and 8th-windiest month. For the whole year in context, see Açailândia's year-round climate.

Daytime high
31°
7th warmest
Overnight low
22°
9th coldest
Rainfall
166 mm
21.5 wet days
Daylight
12 h 18 min
5:58 AM – 6:15 PM
Cloud cover
78%
8th clearest
Wind
6 km/h
8th windiest
Solar energy
5.12 kWh/m²
Travel score
3.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in Açailândia reaches about 31°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°C. Set against its neighbours, December runs about 1°C cooler than November and about 1°C warmer than January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153122
163122
173122
183122
193122
203022
213022
223022
233022
243022
253022
263022
273022
283022
293022
303022
313022

How December really feels in Açailândia

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.

Açailândia weather by month

How December compares with the rest of the year at a glance. December is the 7th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°25527.412.32.9
Feb30° / 22°26025.212.22.9
Mar30° / 22°30028.8122.8
Apr30° / 22°21024.611.93.1
May31° / 22°1021511.84.0
Jun32° / 21°153.311.74.8
Jul33° / 21°91.711.74.5
Aug34° / 22°40.711.84.0
Sep34° / 23°142.9123.7
Oct33° / 23°417.212.13.6
Nov32° / 23°10114.512.23.5
Dec31° / 22°16621.512.33.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32872
42872
52872
62773
72773
82674
92674
102476
112476
122476
132278
142278
152179
162080
171981
181981
191882
201882
211882
221783
231684
241684
251684
261585
271585
281486
291486
301387
311288

Chance of precipitation in December

Any precipitation

Açailândia gets around 166 mm of rain over 21.5 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 70% and peaks near 82% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
156
257
357
457
558
658
759
860
962
1063
1165
1266
1367
1469
1570
1671
1773
1874
1975
2076
2176
2277
2378
2478
2579
2679
2780
2880
2981
3081
3182

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
111890
211890
311890
410900
510900
610900
79910
89910
98920
108920
117930
127930
136940
145950
155950
164960
174960
183970
193970
203970
212980
222980
232980
242971
251981
261981
271981
281981
291981
301981
311981

Wind in December

Winds average 6 km/h in December.

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

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 18 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 5:52 AM to 6:05 AM, and sunset from 6:08 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:526:08
212.35:526:08
312.35:526:09
412.35:536:09
512.35:536:10
612.35:546:10
712.35:546:10
812.35:546:11
912.35:556:11
1012.35:556:12
1112.35:556:12
1212.35:566:13
1312.35:566:13
1412.35:576:14
1512.35:576:14
1612.35:586:15
1712.35:586:15
1812.35:596:16
1912.35:596:16
2012.35:596:17
2112.36:006:17
2212.36:006:18
2312.36:016:18
2412.36:016:19
2512.36:026:19
2612.36:026:19
2712.36:036:20
2812.36:036:20
2912.36:046:21
3012.36:046:21
3112.36:056:22

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.12 kWh/m².

For context, solar energy here swings from a low near 4.47 kWh/m² to a high of 6.28 kWh/m² in September across the year — December's 5.12 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in December

Hazard calendar for Açailândia

In seasonPeak

In December, Açailândia sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Açailândia's monsoon runs December–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 Açailândia?

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

3.3
Sightseeing
8th-best month of the year
4.7
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Açailândia.

What to pack for Açailândia in December

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

In December, Açailândia sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Açailândia 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 Açailândia peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 11UV 15Jul 14UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Açailândia 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 Açailândia is worst in October — around 29 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 2329 µg/m³Jun 206 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar13Moderate
Apr12Moderate
May9Good
Jun6Good
Jul7Good
Aug12Moderate
Sep23Moderate
Oct29Moderate
Nov29Moderate
Dec20Moderate
Location & terrain

Where is Açailândia?

Açailândia sits at 4.9°S, 47.5°W, 243 m above sea level, in Brazil. The nearest listed city is Itinga do Maranhão, 55 km away.

Topography around Açailândia

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

Within 3 km, the terrain around Açailândia has only modest variations in elevation — a maximum elevation change of 148 m around an average of 239 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 258 m; within 80 km, significant variations in elevation — a maximum elevation change of 354 m.

The land around Açailândia is covered by grassland (54%) and artificial surfaces (27%) within 3 km, grassland (51%) and trees (43%) within 16 km, and grassland (55%) and trees (41%) within 80 km.

3 km
148 m
16 km
258 m
80 km
354 m
treesgrasslandcroplandartificial surfaces
December weather nearby: Itinga do Maranhão 55 km · João Lisboa 57 km · Imperatriz 64 km · Rondon do Pará 65 km · Dom Eliseu 74 km · Bom Jesus das Selvas 89 km · Governador Edison Lobão 90 km · Araguatins 103 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 Açailândia (-4.9467°, -47.5047°, elevation 243 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).