São Marcos weather in December

In December, São Marcos sees average daytime highs of 26°C and overnight lows near 15°C, with 172 mm of rain across 15.5 wet days and about 13.8 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 30% of the time in December, and the air most often feels humid.

Daylight stretches from about 13 h 42 min at the start of December to 13 h 48 min by month's end. Set against the rest of the year, December is São Marcos's 6th-clearest and 6th-windiest month. For the whole year in context, see São Marcos's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
172 mm
15.5 wet days
Daylight
13 h 48 min
6:25 AM – 8:16 PM
Cloud cover
61%
6th clearest
Wind
10 km/h
6th windiest
Solar energy
6.35 kWh/m²
Travel score
5.9
out of 10

São Marcos 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 26°C through the month.

A typical December day in São Marcos reaches about 26°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°C. Set against its neighbours, December runs about 2°C warmer than November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12514
22515
32515
42515
52515
62515
72515
82515
92515
102515
112515
122615
132615
142615
152615
162615
172616
182616
192616
202616
212616
222616
232616
242616
252616
262616
272616
282616
292616
302616
312616

São Marcos weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 17°1821813.65.4
Feb26° / 16°16017.3135.3
Mar25° / 15°14214.612.26.1
Apr22° / 13°12511.311.36.4
May19° / 10°14010.410.65.9
Jun17° / 13610.510.25.4
Jul17° / 1681110.35.3
Aug19° / 12810.2116.2
Sep20° / 10°16712.411.85.9
Oct22° / 12°21014.512.75.9
Nov24° / 13°15413.413.46.4
Dec26° / 15°17215.513.85.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
24951
34951
44852
54852
64852
74852
84753
94852
104753
114753
124852
134852
144852
154852
164753
174852
184852
194753
204852
214852
224852
234852
244753
254753
264555
274654
284555
294555
304456
314456

Chance of precipitation in December

Any precipitation

São Marcos gets around 172 mm of rain over 15.5 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 50% and peaks near 53% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
347
447
547
648
748
848
949
1049
1150
1250
1350
1450
1551
1651
1751
1851
1951
2051
2151
2251
2352
2452
2552
2652
2752
2852
2952
3053
3153

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 20% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12333369
22232369
322323610
421323710
520323710
620313811
719313811
818313912
918313912
1017313913
1116313914
1215304014
1315304015
1414294016
1514294017
1613284018
1713274020
1813264021
1913264022
2012253923
2112253924
2211243926
2311243827
2410243828
2510233829
2610233830
279233731
289223732
298223732
308223733
317223733

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 10 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
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 42 min at the start of December to 13 h 48 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 6:23 AM to 6:33 AM, and sunset from 8:06 PM to 8:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.76:238:06
213.76:238:06
313.76:238:07
413.86:238:08
513.86:238:08
613.86:238:09
713.86:238:10
813.86:238:11
913.86:238:11
1013.86:248:12
1113.86:248:13
1213.86:248:13
1313.86:248:14
1413.86:258:14
1513.86:258:15
1613.86:258:16
1713.86:268:16
1813.86:268:17
1913.86:268:17
2013.96:278:18
2113.96:278:18
2213.96:288:19
2313.96:288:19
2413.96:298:20
2513.86:298:20
2613.86:308:21
2713.86:308:21
2813.86:318:21
2913.86:318:22
3013.86:328:22
3113.86:338:22

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.35 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.56 kWh/m² to a high of 6.35 kWh/m² in December across the year — December's 6.35 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.4Intense
56.4Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
316.3Intense
Planning a trip in December

Is December a good time to visit São Marcos?

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

5.9
Sightseeing
5th-best month of the year
5.5
Beach & pool
1st-best month of the year

December is a reasonable time to visit São Marcos for sightseeing.

What to pack for São Marcos in December

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

In December, São Marcos sees daytime highs around 26°C and nights near 15°C. Pack rain gear and sun protection. Worth having: light clothes. About 16 days see rain.

rain gearsun protectionlight clothes

UV index in São Marcos 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 São Marcos peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 17UV 14Jun 21UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5High
Jun4Moderate
Jul4Moderate
Aug6High
Sep8Very high
Oct8Very high
Nov12Extreme
Dec13Extreme

Air quality in São Marcos 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 Marcos is worst in August — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (February, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1822 µg/m³Feb 149 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb9Good
Mar10Good
Apr11Good
May12Moderate
Jun12Good
Jul15Moderate
Aug22Moderate
Sep18Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is São Marcos?

São Marcos sits at 29.0°S, 51.1°W, 741 m above sea level, in Brazil. The nearest listed city is Flores da Cunha, 13 km away.

Topography around São Marcos

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

Within 3 km, the terrain around São Marcos has significant variations in elevation — a maximum elevation change of 399 m around an average of 750 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 716 m; within 80 km, large variations in elevation — a maximum elevation change of 1,135 m.

The land around São Marcos is covered by trees (55%) and grassland (27%) within 3 km, trees (65%) and grassland (30%) within 16 km, and trees (59%) and grassland (24%) within 80 km.

3 km
399 m
16 km
716 m
80 km
1,135 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Flores da Cunha 13 km · Caxias do Sul 24 km · Farroupilha 39 km · Nova Petrópolis 45 km · Veranópolis 47 km · Gramado 49 km · Bento Gonçalves 49 km · Canela 49 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 Marcos (-28.9711°, -51.0681°, elevation 741 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).