Rosário Oeste weather in December

In December, Rosário Oeste sees average daytime highs of 31°C and overnight lows near 23°C, with 205 mm of rain across 24.3 wet days and about 12.9 hours of daylight. It is the 5th-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 7% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 48 min at the start of December to 12 h 54 min by month's end. Set against the rest of the year, December is Rosário Oeste's 10th-clearest and 6th-windiest month. For the whole year in context, see Rosário Oeste's year-round climate.

Daytime high
31°
5th warmest
Overnight low
23°
11th coldest
Rainfall
205 mm
24.3 wet days
Daylight
12 h 54 min
6:16 AM – 7:08 PM
Cloud cover
79%
10th clearest
Wind
7 km/h
6th windiest
Solar energy
5.48 kWh/m²
Travel score
2.9
out of 10

Rosário Oeste 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 31°C through the month.

A typical December day in Rosário Oeste 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 33°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 Rosário Oeste

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.

Rosário Oeste weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°24425.612.82.9
Feb31° / 23°22124.612.52.8
Mar31° / 23°20424.812.12.9
Apr31° / 22°9715.711.73.9
May30° / 20°315.311.35.5
Jun30° / 19°91.311.16.1
Jul31° / 18°50.611.26.1
Aug33° / 20°101.511.54.6
Sep34° / 22°427.411.93.4
Oct33° / 23°11716.712.32.9
Nov32° / 23°1702112.72.9
Dec31° / 23°20524.312.92.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11783
21783
31783
41684
51684
61684
71684
81783
91783
101783
111882
121882
132080
142080
152080
162179
172179
182278
192278
202377
212377
222377
232377
242377
252278
262278
272278
282278
292179
302080
312080

Chance of precipitation in December

Any precipitation

Rosário Oeste gets around 205 mm of rain over 24.3 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 79% and peaks near 81% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
178
279
379
479
579
679
779
879
979
1079
1178
1278
1378
1478
1578
1678
1778
1878
1978
2078
2178
2278
2379
2479
2579
2680
2780
2880
2980
3081
3181

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 94% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
103934
203934
303925
403925
512925
612925
712925
812925
912925
1012925
1111935
1211935
1311944
1411944
1511944
1611944
1711944
1811944
1911944
2011944
2111953
2211953
2311953
2411953
2511953
2601963
2701963
2801963
2901963
3001963
3101963

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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 48 min at the start of December to 12 h 54 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 6:11 AM to 6:23 AM, and sunset from 7:00 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:117:00
212.86:117:00
312.86:117:01
412.86:127:02
512.86:127:02
612.86:127:03
712.86:127:03
812.96:137:04
912.96:137:04
1012.96:137:05
1112.96:147:05
1212.96:147:06
1312.96:147:07
1412.96:157:07
1512.96:157:08
1612.96:167:08
1712.96:167:09
1812.96:167:09
1912.96:177:10
2012.96:177:10
2112.96:187:11
2212.96:187:11
2312.96:197:12
2412.96:197:12
2512.96:207:12
2612.96:207:13
2712.96:217:13
2812.96:217:14
2912.96:227:14
3012.96:227:15
3112.96:237:15

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.48 kWh/m².

For context, solar energy here swings from a low near 4.49 kWh/m² to a high of 6 kWh/m² in October across the year — December's 5.48 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in December

Hazard calendar for Rosário Oeste

In seasonPeak

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

Rosário Oeste's monsoon runs October–March, 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 Rosário Oeste?

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

2.9
Sightseeing
7th-best month of the year
4.3
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Rosário Oeste.

What to pack for Rosário Oeste in December

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

In December, Rosário Oeste sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in Rosário Oeste 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 Rosário Oeste peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 21UV 15Sep 14UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep5High
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Rosário Oeste 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 Rosário Oeste is worst in September — around 64 µg/m³ PM2.5 (unhealthy), about 8.8× the cleanest month (May, 7 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodSep 1559 µg/m³May 217 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar8Good
Apr8Good
May7Good
Jun7Good
Jul10Good
Aug26Moderate
Sep64Unhealthy
Oct20Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Rosário Oeste?

Rosário Oeste sits at 14.8°S, 56.4°W, 201 m above sea level, in Brazil. The nearest listed city is Nobres, 17 km away.

Topography around Rosário Oeste

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

Within 3 km, the terrain around Rosário Oeste has only modest variations in elevation — a maximum elevation change of 116 m around an average of 198 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 423 m; within 80 km, large variations in elevation — a maximum elevation change of 740 m.

The land around Rosário Oeste is covered by trees (48%) and grassland (37%) within 3 km, trees (43%) and grassland (42%) within 16 km, and trees (44%) and grassland (37%) within 80 km.

3 km
116 m
16 km
423 m
80 km
740 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Nobres 17 km · Diamantino 48 km · Barra do Bugres 85 km · Cuiabá 92 km · Nova Olímpia 93 km · Várzea Grande 96 km · Chapada dos Guimarães 101 km · Tangará da Serra 116 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 Rosário Oeste (-14.8361°, -56.4275°, elevation 201 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).