Rio Brilhante weather in December

In December, Rio Brilhante sees average daytime highs of 32°C and overnight lows near 22°C, with 154 mm of rain across 17.6 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 24% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 12 min at the start of December to 13 h 18 min by month's end. Set against the rest of the year, December is Rio Brilhante's 11th-clearest and 8th-windiest month. For the whole year in context, see Rio Brilhante's year-round climate.

Daytime high
32°
1st warmest
Overnight low
22°
10th coldest
Rainfall
154 mm
17.6 wet days
Daylight
13 h 18 min
5:55 AM – 7:14 PM
Cloud cover
66%
11th clearest
Wind
8 km/h
8th windiest
Solar energy
6.18 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 32°C through the month.

A typical December day in Rio Brilhante reaches about 32°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 35°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13222
23222
33222
43222
53222
63222
73222
83222
93222
103222
113222
123222
133222
143222
153222
163222
173222
183222
193222
203222
213222
223222
233222
243223
253223
263223
273223
283223
293223
303223
313223

How December really feels in Rio Brilhante

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.

Rio Brilhante weather by month

How December compares with the rest of the year at a glance. December is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°18219.713.23.2
Feb32° / 22°14217.212.73.3
Mar32° / 22°11414.912.23.7
Apr30° / 20°688.611.55.1
May27° / 17°767.7116.9
Jun26° / 16°515.710.77.5
Jul27° / 15°374.710.87.7
Aug29° / 17°424.711.36.3
Sep31° / 19°827.711.94.9
Oct32° / 21°1201312.53.9
Nov32° / 21°13713.8133.7
Dec32° / 22°15417.613.33.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24060
34060
43961
53961
63862
73961
83961
93961
103961
114060
124159
134258
144258
154357
164456
174456
184456
194555
204555
214456
224357
234357
244258
254258
264159
274060
283961
293961
303961
313862

Chance of precipitation in December

Any precipitation

Rio Brilhante gets around 154 mm of rain over 17.6 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 57% and peaks near 63% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
154
255
356
456
556
657
756
856
956
1056
1155
1255
1355
1454
1554
1654
1754
1854
1955
2055
2156
2256
2357
2458
2559
2660
2760
2861
2962
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 56% of days. Sticky, muggy-or-worse air turns up on roughly 88% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
135143147
235133149
334123051
434113052
534113052
634103053
723103154
82393155
92393155
102393254
112393254
121393354
131393354
141293454
151283455
161283554
171283554
181283554
191283653
201283554
210173557
220173557
230163558
240163459
250153361
260153361
270153262
280143164
290143065
300142966
310142966

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 12 min at the start of December to 13 h 18 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 5:51 AM to 6:02 AM, and sunset from 7:05 PM to 7:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:517:05
213.25:517:06
313.35:517:06
413.35:517:07
513.35:517:08
613.35:527:08
713.35:527:09
813.35:527:09
913.35:527:10
1013.35:537:11
1113.35:537:11
1213.35:537:12
1313.35:547:12
1413.35:547:13
1513.35:547:14
1613.35:557:14
1713.35:557:15
1813.35:557:15
1913.35:567:16
2013.35:567:16
2113.35:577:17
2213.35:577:17
2313.35:587:18
2413.35:587:18
2513.35:597:18
2613.35:597:19
2713.36:007:19
2813.36:007:20
2913.36:017:20
3013.36:017:20
3113.36:027:21

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.18 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.49 kWh/m² to a high of 6.18 kWh/m² in December across the year — December's 6.18 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.1Intense
316.1Intense
Planning a trip in December

Hazard calendar for Rio Brilhante

In seasonPeak

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

Rio Brilhante's rainy season runs October–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 Rio Brilhante?

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

3.3
Sightseeing
10th-best month of the year
5.3
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Rio Brilhante.

What to pack for Rio Brilhante in December

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

In December, Rio Brilhante sees daytime highs around 32°C and nights near 22°C. Pack light clothes, rain gear and sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Rio Brilhante 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 Rio Brilhante peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highModerateExtremeJan 19UV 15Sep 14UV 3
UV index (midday)Level
Jan16Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep3Moderate
Oct12Extreme
Nov12Extreme
Dec13Extreme

Air quality in Rio Brilhante 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 Rio Brilhante is worst in September — around 25 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (April, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1623 µg/m³Apr 105 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar6Good
Apr5Good
May6Good
Jun6Good
Jul6Good
Aug14Moderate
Sep25Moderate
Oct14Moderate
Nov8Good
Dec7Good
Location & terrain

Where is Rio Brilhante?

Rio Brilhante sits at 21.8°S, 54.5°W, 319 m above sea level, in Brazil. The nearest listed city is Itaporã, 40 km away.

Topography around Rio Brilhante

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

Within 3 km, the terrain around Rio Brilhante has only modest variations in elevation — a maximum elevation change of 39 m around an average of 312 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, significant variations in elevation — a maximum elevation change of 312 m.

The land around Rio Brilhante is covered by cropland (38%), trees (25%) and artificial surfaces (20%) within 3 km, cropland (60%) and trees (21%) within 16 km, and cropland (64%) within 80 km.

3 km
39 m
16 km
126 m
80 km
312 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Itaporã 40 km · Nova Alvorada do Sul 41 km · Dourados 54 km · Fátima do Sul 64 km · Maracaju 68 km · Caarapó 97 km · Sidrolândia 106 km · Nova Andradina 133 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 Rio Brilhante (-21.8019°, -54.5464°, elevation 319 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).