Formoso do Araguaia weather in December

In December, Formoso do Araguaia sees average daytime highs of 31°C and overnight lows near 23°C, with 262 mm of rain across 24.6 wet days and about 12.7 hours of daylight. It is the 9th-warmest and 3rd-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 8% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Formoso do Araguaia's 11th-clearest and 9th-windiest month. For the whole year in context, see Formoso do Araguaia's year-round climate.

Daytime high
31°
9th warmest
Overnight low
23°
9th coldest
Rainfall
262 mm
24.6 wet days
Daylight
12 h 42 min
5:54 AM – 6:35 PM
Cloud cover
81%
11th clearest
Wind
5 km/h
9th windiest
Solar energy
5.18 kWh/m²
Travel score
2.9
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 Formoso do Araguaia reaches about 31°C in the afternoon and slips back to 23°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 34°C. Set against its neighbours, December runs on par with November and on par with 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
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313123

How December really feels in Formoso do Araguaia

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.

Formoso do Araguaia weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°29126.412.62.9
Feb31° / 23°25623.612.42.8
Mar31° / 23°26325.512.12.9
Apr32° / 23°1501711.73.4
May33° / 23°314.911.54.1
Jun33° / 22°20.411.34.5
Jul34° / 21°0011.44.3
Aug35° / 23°10.311.63.2
Sep36° / 24°193.211.92.4
Oct34° / 24°10914.312.32.7
Nov32° / 23°21822.112.52.9
Dec31° / 23°26224.612.72.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11684
21684
31783
41783
51783
61783
71783
81783
91882
101882
111882
121882
131882
141882
151882
161882
171981
181981
191981
201981
212080
222080
232080
242080
252080
262080
272080
281981
291981
301981
311981

Chance of precipitation in December

Any precipitation

Formoso do Araguaia gets around 262 mm of rain over 24.6 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 80% and peaks near 82% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
179
279
379
479
579
679
779
880
980
1080
1180
1280
1380
1480
1580
1680
1780
1880
1980
2080
2180
2280
2380
2480
2580
2680
2780
2881
2981
3082
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 92% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
14897
24897
34897
43898
53898
63898
73898
82908
92908
102908
112908
122917
132917
142917
152926
162926
172935
182935
192944
202944
212944
222944
232944
242944
252944
262944
272944
282944
292944
302935
312935

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 36 min at the start of December to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:49 AM to 6:01 AM, and sunset from 6:27 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:496:27
212.65:496:28
312.75:496:28
412.75:496:29
512.75:506:29
612.75:506:30
712.75:506:30
812.75:516:31
912.75:516:31
1012.75:516:32
1112.75:526:32
1212.75:526:33
1312.75:526:33
1412.75:536:34
1512.75:536:34
1612.75:546:35
1712.75:546:35
1812.75:546:36
1912.75:556:36
2012.75:556:37
2112.75:566:37
2212.75:566:38
2312.75:576:38
2412.75:576:39
2512.75:586:39
2612.75:586:40
2712.75:596:40
2812.75:596:41
2912.76:006:41
3012.76:006:41
3112.76:016:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.18 kWh/m².

For context, solar energy here swings from a low near 4.88 kWh/m² to a high of 6.06 kWh/m² in September across the year — December's 5.18 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in December

Hazard calendar for Formoso do Araguaia

In seasonPeak

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

Formoso do Araguaia's monsoon runs November–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 Formoso do Araguaia?

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

2.9
Sightseeing
6th-best month of the year
4.3
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Formoso do Araguaia.

What to pack for Formoso do Araguaia in December

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

In December, Formoso do Araguaia sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in Formoso do Araguaia in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Formoso do Araguaia peaks around February 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 14UV 15Jun 22UV 8
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May10Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep12Extreme
Oct10Extreme
Nov12Extreme
Dec12Extreme

Air quality in Formoso do Araguaia 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 Formoso do Araguaia is worst in September — around 27 µg/m³ PM2.5 (moderate), about 6.9× the cleanest month (June, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 2327 µg/m³Jun 224 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb8Good
Mar9Good
Apr8Good
May8Good
Jun4Good
Jul5Good
Aug8Good
Sep27Moderate
Oct26Moderate
Nov11Good
Dec9Good
Location & terrain

Where is Formoso do Araguaia?

Formoso do Araguaia sits at 11.8°S, 49.5°W, 247 m above sea level, in Brazil. The nearest listed city is Gurupi, 51 km away.

Topography around Formoso do Araguaia

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

Within 3 km, the terrain around Formoso do Araguaia has only modest variations in elevation — a maximum elevation change of 62 m around an average of 252 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 103 m; within 80 km, significant variations in elevation — a maximum elevation change of 398 m.

The land around Formoso do Araguaia is covered by grassland (42%) and trees (33%) within 3 km, grassland (44%) and trees (40%) within 16 km, and grassland (46%) and trees (43%) within 80 km.

3 km
62 m
16 km
103 m
80 km
398 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Gurupi 51 km · Lagoa da Confusão 112 km · Porto Nacional 171 km · São Miguel do Araguaia 178 km · Porangatu 187 km · Paraíso do Tocantins 194 km · Palmas 224 km · Minaçu 240 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 Formoso do Araguaia (-11.7967°, -49.5289°, elevation 247 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).