São Mateus do Sul weather in December

In December, São Mateus do Sul sees average daytime highs of 27°C and overnight lows near 17°C, with 144 mm of rain across 17.2 wet days and about 13.6 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels humid.

Daylight stretches from about 13 h 30 min at the start of December to 13 h 36 min by month's end. Set against the rest of the year, December is São Mateus do Sul's 9th-clearest and 5th-windiest month. For the whole year in context, see São Mateus do Sul's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
144 mm
17.2 wet days
Daylight
13 h 36 min
6:29 AM – 8:06 PM
Cloud cover
72%
9th clearest
Wind
9 km/h
5th windiest
Solar energy
5.75 kWh/m²
Travel score
5.3
out of 10

São Mateus do Sul is 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 27°C through the month.

A typical December day in São Mateus do Sul reaches about 27°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12616
22616
32617
42617
52617
62617
72617
82617
92617
102617
112617
122717
132717
142717
152717
162717
172717
182717
192717
202717
212717
222718
232718
242718
252718
262718
272718
282718
292718
302718
312718

São Mateus do Sul weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 18°18421.213.44.7
Feb27° / 18°15719.112.94.8
Mar26° / 17°10814.512.25.8
Apr24° / 15°769.311.46.8
May21° / 12°1059.210.86.5
Jun20° / 10°1099.110.46.3
Jul20° / 858.310.56.5
Aug22° / 10°857.711.17.1
Sep23° / 12°1401111.86.5
Oct24° / 14°15015.212.65.9
Nov25° / 16°1231413.36.0
Dec27° / 17°14417.213.65.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 70%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23367
33268
43268
53268
63169
73169
83169
93169
103169
113070
123169
133169
143268
153169
163070
173070
183070
193070
203070
212971
222971
232971
242971
252971
262872
272872
282773
292773
302674
312674

Chance of precipitation in December

Any precipitation

São Mateus do Sul gets around 144 mm of rain over 17.2 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 56% and peaks near 63% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
150
251
351
451
552
652
752
852
953
1053
1154
1254
1355
1455
1556
1656
1757
1857
1957
2058
2158
2258
2359
2459
2560
2661
2761
2862
2962
3063
3163

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 38% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
192740240
282741240
382641250
482541260
572541270
672441280
772441280
872341290
972240300
1072240310
1162140320
1262140330
1362040340
1462040350
1551940360
1651939370
1751839380
1851839390
1941838400
2041738410
2141737420
2231736430
2331636450
2431635460
2521635470
2621534480
2721533490
2821533501
2921432511
3021432511
3121432511

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 30 min at the start of December to 13 h 36 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 6:26 AM to 6:37 AM, and sunset from 7:56 PM to 8:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.56:267:56
213.56:267:57
313.56:267:58
413.56:277:58
513.56:277:59
613.56:278:00
713.66:278:00
813.66:278:01
913.66:278:02
1013.66:288:02
1113.66:288:03
1213.66:288:04
1313.66:288:04
1413.66:298:05
1513.66:298:05
1613.66:298:06
1713.66:308:07
1813.66:308:07
1913.66:318:08
2013.66:318:08
2113.66:318:09
2213.66:328:09
2313.66:328:10
2413.66:338:10
2513.66:338:10
2613.66:348:11
2713.66:348:11
2813.66:358:12
2913.66:368:12
3013.66:368:12
3113.66:378:13

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.75 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.78 kWh/m² to a high of 5.75 kWh/m² in December across the year — December's 5.75 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in December

Is December a good time to visit São Mateus do Sul?

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

5.3
Sightseeing
10th-best month of the year
5.3
Beach & pool
4th-best month of the year

December is a reasonable time to visit São Mateus do Sul for sightseeing.

What to pack for São Mateus do Sul in December

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

In December, São Mateus do Sul sees daytime highs around 27°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

UV index in São Mateus do Sul in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Mateus do Sul peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 19UV 15Jul 12UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5High
Jul5High
Aug6High
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in São Mateus do Sul 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 São Mateus do Sul is worst in September — around 16 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1315 µg/m³Dec 197 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar7Good
Apr8Good
May9Good
Jun8Good
Jul10Good
Aug13Moderate
Sep16Moderate
Oct10Good
Nov8Good
Dec7Good
Location & terrain

Where is São Mateus do Sul?

São Mateus do Sul sits at 25.9°S, 50.4°W, 792 m above sea level, in Brazil. The nearest listed city is Três Barras, 27 km away.

Topography around São Mateus do Sul

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Mateus do Sul.

Within 3 km, the terrain around São Mateus do Sul has only modest variations in elevation — a maximum elevation change of 80 m around an average of 775 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 159 m; within 80 km, large variations in elevation — a maximum elevation change of 879 m.

The land around São Mateus do Sul is covered by trees (40%), grassland (22%) and artificial surfaces (20%) within 3 km, trees (56%) and cropland (32%) within 16 km, and trees (60%) and cropland (33%) within 80 km.

3 km
80 m
16 km
159 m
80 km
879 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Três Barras 27 km · Canoinhas 34 km · Irati 53 km · Papanduva 60 km · Palmeira 62 km · Mafra 63 km · Rio Negro 64 km · Lapa 68 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 São Mateus do Sul (-25.8742°, -50.3828°, elevation 792 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).