Alto Alegre do Maranhão weather in December

In December, Alto Alegre do Maranhão sees average daytime highs of 34°C and overnight lows near 24°C, with 126 mm of rain across 14.6 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 6th-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 16% 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 Alto Alegre do Maranhão's 8th-clearest and 6th-windiest month. For the whole year in context, see Alto Alegre do Maranhão's year-round climate.

Daytime high
34°
5th warmest
Overnight low
24°
10th coldest
Rainfall
126 mm
14.6 wet days
Daylight
12 h 12 min
5:47 AM – 6:01 PM
Cloud cover
69%
8th clearest
Wind
7 km/h
6th windiest
Solar energy
5.4 kWh/m²
Travel score
2.7
out of 10

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 Alto Alegre do Maranhão 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 Alto Alegre do Maranhão

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
1 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.

Alto Alegre do Maranhão weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°25125.112.22.6
Feb31° / 23°26324.812.12.6
Mar31° / 23°32829122.5
Apr31° / 23°27726.611.92.7
May31° / 23°13218.211.83.5
Jun32° / 23°346.611.84.5
Jul33° / 23°142.711.84.4
Aug34° / 23°5111.93.7
Sep35° / 24°71.3123.0
Oct36° / 25°14312.12.7
Nov35° / 25°457.112.22.7
Dec34° / 24°12614.612.22.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34555
44555
54555
64357
74258
84258
94258
104060
114060
123961
133862
143763
153763
163565
173466
183466
193268
203268
213169
223070
233070
242971
252971
262872
272773
282773
292674
302575
312575

Chance of precipitation in December

Any precipitation

Alto Alegre do Maranhão gets around 126 mm of rain over 14.6 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 48% and peaks near 69% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
130
230
331
431
532
633
734
835
937
1038
1140
1241
1343
1445
1546
1648
1749
1851
1952
2054
2155
2257
2358
2460
2561
2663
2764
2865
2967
3068
3169

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
116786
216786
316777
416777
516777
615787
715787
814797
914797
1013807
1112808
1211818
1310828
1410819
159829
1688210
1778310
1868311
1968212
2058213
2158114
2248115
2348016
2447917
2547818
2647719
2737720
2837621
2937621
3037522
3137522

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
207calm
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 5:41 AM to 5:54 AM, and sunset from 5:54 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:415:54
212.25:415:55
312.25:415:55
412.25:425:56
512.25:425:56
612.25:435:57
712.25:435:57
812.25:435:57
912.25:445:58
1012.25:445:58
1112.25:455:59
1212.25:455:59
1312.25:456:00
1412.25:466:00
1512.25:466:01
1612.25:476:01
1712.25:476:02
1812.25:486:02
1912.25:486:03
2012.25:486:03
2112.25:496:04
2212.25:496:04
2312.25:506:05
2412.25:506:05
2512.25:516:05
2612.25:516:06
2712.25:526:06
2812.25:526:07
2912.25:536:07
3012.25:536:08
3112.25:546:08

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.4 kWh/m².

For context, solar energy here swings from a low near 4.37 kWh/m² to a high of 6.33 kWh/m² in October across the year — December's 5.4 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.0Bright
315.0Bright
Planning a trip in December

Hazard calendar for Alto Alegre do Maranhão

In seasonPeak

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

Alto Alegre do Maranhão'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 Alto Alegre do Maranhão?

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
5.2
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Alto Alegre do Maranhão.

What to pack for Alto Alegre do Maranhão in December

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

In December, Alto Alegre do Maranhão 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 Alto Alegre do Maranhão 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 Alto Alegre do Maranhão peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 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 15Aug 10UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Alto Alegre do Maranhão 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 Alto Alegre do Maranhão is worst in October — around 35 µg/m³ PM2.5 (moderate), about 4.0× the cleanest month (June, 9 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 2134 µg/m³Jun 159 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar14Moderate
Apr13Moderate
May10Good
Jun9Good
Jul11Good
Aug13Moderate
Sep19Moderate
Oct35Moderate
Nov30Moderate
Dec23Moderate
Location & terrain

Where is Alto Alegre do Maranhão?

Alto Alegre do Maranhão sits at 4.2°S, 44.4°W, 58 m above sea level, in Brazil. The nearest listed city is São Mateus do Maranhão, 19 km away.

Topography around Alto Alegre do Maranhão

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Alto Alegre do Maranhão.

Within 3 km, the terrain around Alto Alegre do Maranhão has only modest variations in elevation — a maximum elevation change of 31 m around an average of 52 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, only modest variations in elevation — a maximum elevation change of 227 m.

The land around Alto Alegre do Maranhão is covered by trees (32%), grassland (32%) and shrubs (24%) within 3 km, grassland (43%) and trees (42%) within 16 km, and trees (48%) and grassland (46%) within 80 km.

3 km
31 m
16 km
100 m
80 km
227 m
treesshrubsgrasslandartificial surfaceswaterwetland
December weather nearby: São Mateus do Maranhão 19 km · Peritoró 23 km · São Luís Gonzaga do Maranhão 31 km · Coroatá 37 km · Bacabal 37 km · Pedreiras 43 km · Trizidela do Vale 44 km · Timbiras 56 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 Alto Alegre do Maranhão (-4.2128°, -44.4464°, elevation 58 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).