Barreiras weather in December

In December, Barreiras sees average daytime highs of 30°C and overnight lows near 21°C, with 143 mm of rain across 14.7 wet days and about 12.7 hours of daylight. It is the 6th-warmest and 2nd-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 18% of the time in December, and the air most often feels muggy.

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

Daytime high
30°
6th warmest
Overnight low
21°
10th coldest
Rainfall
143 mm
14.7 wet days
Daylight
12 h 42 min
5:35 AM – 6:17 PM
Cloud cover
72%
11th clearest
Wind
6 km/h
9th windiest
Solar energy
5.84 kWh/m²
Travel score
4.2
out of 10

Barreiras 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

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

A typical December day in Barreiras reaches about 30°C in the afternoon and slips back to 21°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 34°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13021
23021
33021
43021
53021
63021
73021
83021
93021
103021
113021
123021
133021
143021
153021
163021
173021
183021
193021
203021
213021
223021
233021
243021
253021
263021
273021
283021
293021
303021
313021

How December really feels in Barreiras

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Barreiras weather by month

How December compares with the rest of the year at a glance. December is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°13916.512.64.2
Feb30° / 21°12015.712.44.2
Mar30° / 21°14216.512.14.2
Apr30° / 20°6810.211.74.8
May30° / 20°183.211.45.7
Jun30° / 18°20.311.36.4
Jul30° / 17°0011.46.5
Aug31° / 18°10.111.65.6
Sep33° / 20°81.111.94.2
Oct33° / 22°516.512.33.6
Nov31° / 21°15414.212.63.9
Dec30° / 21°14314.712.74.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 66%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
43070
52971
63070
73070
83070
93169
103169
113367
123367
133466
143466
153466
163466
173565
183565
193565
203664
213664
223664
233664
243664
253763
263763
273763
283664
293664
303763
313763

Chance of precipitation in December

Any precipitation

Barreiras gets around 143 mm of rain over 14.7 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 51% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
150
250
350
450
551
651
751
851
951
1051
1150
1250
1349
1449
1548
1647
1747
1846
1945
2045
2144
2244
2344
2445
2545
2646
2746
2847
2948
3049
3150

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 66% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14206115
24196116
34186216
44176217
54176217
64166218
73166318
83166318
93166318
103166318
114166317
124166317
134176316
144176415
154176514
164186414
174186513
184196512
194196611
204206610
214206610
22420679
23420679
24319708
25319708
26319708
27319708
28318718
29318718
30318709
31217729

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 42 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 0 minutes over December. Sunrise moves from 5:30 AM to 5:42 AM, and sunset from 6:10 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:306:10
212.75:306:10
312.75:306:11
412.75:316:11
512.75:316:12
612.75:316:12
712.75:316:13
812.75:326:13
912.75:326:14
1012.75:326:14
1112.75:336:15
1212.75:336:15
1312.75:346:16
1412.75:346:16
1512.75:346:17
1612.75:356:17
1712.75:356:18
1812.75:366:18
1912.75:366:19
2012.75:376:19
2112.75:376:20
2212.75:386:20
2312.75:386:21
2412.75:386:21
2512.75:396:22
2612.75:396:22
2712.75:406:23
2812.75:406:23
2912.75:416:23
3012.75:416:24
3112.75:426:24

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.84 kWh/m².

For context, solar energy here swings from a low near 4.87 kWh/m² to a high of 6.5 kWh/m² in September across the year — December's 5.84 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.9Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in December

Hazard calendar for Barreiras

In seasonPeak

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

Barreiras's rainy season runs November–March, when most of the year's rain falls.

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

Is December a good time to visit Barreiras?

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

4.2
Sightseeing
6th-best month of the year
5.9
Beach & pool
8th-best month of the year

December is a reasonable time to visit Barreiras for sightseeing.

What to pack for Barreiras in December

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

In December, Barreiras sees daytime highs around 30°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Barreiras in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Barreiras peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 18UV 15Jun 23UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov14Extreme
Dec13Extreme

Air quality in Barreiras 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 Barreiras is worst in September — around 25 µg/m³ PM2.5 (moderate), about 5.7× the cleanest month (July, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 2324 µg/m³Jul 154 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar7Good
Apr6Good
May5Good
Jun5Good
Jul4Good
Aug6Good
Sep25Moderate
Oct24Moderate
Nov9Good
Dec9Good
Location & terrain

Where is Barreiras?

Barreiras sits at 12.2°S, 45.0°W, 472 m above sea level, in Brazil. The nearest listed city is São Desidério, 23 km away.

Topography around Barreiras

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

Within 3 km, the terrain around Barreiras has significant variations in elevation — a maximum elevation change of 272 m around an average of 483 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 315 m; within 80 km, significant variations in elevation — a maximum elevation change of 397 m.

The land around Barreiras is covered by artificial surfaces (46%) and trees (24%) within 3 km, shrubs (40%) and trees (37%) within 16 km, and shrubs (48%) and trees (23%) within 80 km.

3 km
272 m
16 km
315 m
80 km
397 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: São Desidério 23 km · Riachão das Neves 46 km · Luis Eduardo Magalhães 87 km · Formosa do Rio Preto 125 km · Serra Dourada 132 km · Santa Rita de Cássia 137 km · Santana 138 km · Correntina 138 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 Barreiras (-12.1528°, -44.99°, elevation 472 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).