San Carlos weather in December

In December, San Carlos sees average daytime highs of 25°C and overnight lows near 16°C, with 82 mm of rain across 8.5 wet days and about 14.3 hours of daylight. It is the 3rd-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 24°C in the first days to 26°C by the end. The sky is clear or mostly clear about 44% of the time in December, and the air most often feels humid.

Daylight stretches from about 14 h 12 min at the start of December to 14 h 18 min by month's end. Set against the rest of the year, December is San Carlos's 2nd-clearest and 7th-windiest month. For the whole year in context, see San Carlos's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
16°
9th coldest
Rainfall
82 mm
8.5 wet days
Daylight
14 h 18 min
6:26 AM – 8:46 PM
Cloud cover
48%
2nd clearest
Wind
16 km/h
7th windiest
Solar energy
7.38 kWh/m²
Travel score
7.3
out of 10

San Carlos is city in the Maldonado Department of southern Uruguay.

Density
2,753/km²
people per km²
Founded
1763

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 24°C in the first days to 26°C by the end.

A typical December day in San Carlos reaches about 25°C in the afternoon and slips back to 16°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, December runs about 3°C warmer than November and about 1°C cooler than January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12415
22415
32415
42415
52415
62415
72415
82415
92416
102416
112516
122516
132516
142516
152516
162516
172516
182516
192517
202517
212617
222617
232617
242617
252617
262617
272617
282617
292617
302618
312618

San Carlos weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°788.314.17.1
Feb26° / 18°99913.36.8
Mar24° / 17°92912.37.2
Apr21° / 14°1048.911.26.7
May18° / 11°837.910.26.0
Jun15° / 918.79.74.7
Jul14° / 9499.94.3
Aug16° / 958.510.75.1
Sep17° / 908.511.85.6
Oct19° / 12°1029.712.96.3
Nov22° / 14°908.313.87.0
Dec25° / 16°828.514.37.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35941
45941
55941
65941
75941
85941
95941
105842
115842
125842
135842
145842
155941
165842
175842
185941
195941
205941
215941
225941
236040
246040
256040
266040
276040
286139
296139
306139
316139

Chance of precipitation in December

Any precipitation

San Carlos gets around 82 mm of rain over 8.5 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
225
325
425
525
625
725
826
926
1026
1126
1226
1327
1427
1528
1628
1728
1829
1929
2029
2129
2229
2329
2429
2528
2628
2728
2828
2928
3027
3127

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 31% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
138282770
238282770
337282770
437282780
536282780
635282880
735282890
834282990
9332829100
10322830100
11312830110
12302831110
13282831120
14272832130
15262732140
16252733150
17242733161
18232633171
19222633181
20212533191
21212533201
22202433211
23192433222
24192333232
25182333242
26182232253
27172232263
28172232263
29162231274
30162231274
31152231285

Wind in December

Winds average 16 km/h in December.

Across December, daily wind ranges from about 16 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 12 min at the start of December to 14 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 6:24 AM to 6:34 AM, and sunset from 8:34 PM to 8:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.26:248:34
214.26:248:35
314.26:248:36
414.26:248:37
514.26:248:38
614.26:248:39
714.26:248:39
814.36:248:40
914.36:258:41
1014.36:258:42
1114.36:258:42
1214.36:258:43
1314.36:258:44
1414.36:268:44
1514.36:268:45
1614.36:268:46
1714.36:268:46
1814.36:278:47
1914.36:278:47
2014.36:288:48
2114.36:288:48
2214.36:298:49
2314.36:298:49
2414.36:308:50
2514.36:308:50
2614.36:318:50
2714.36:318:51
2814.36:328:51
2914.36:328:51
3014.36:338:52
3114.36:348:52

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.38 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 7.38 kWh/m² in December across the year — December's 7.38 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.3Intense
27.3Intense
37.3Intense
47.3Intense
57.4Intense
67.4Intense
77.4Intense
87.4Intense
97.4Intense
107.4Intense
117.4Intense
127.4Intense
137.4Intense
147.4Intense
157.4Intense
167.4Intense
177.4Intense
187.3Intense
197.3Intense
207.3Intense
217.3Intense
227.3Intense
237.3Intense
247.3Intense
257.3Intense
267.3Intense
277.3Intense
287.3Intense
297.3Intense
307.3Intense
317.3Intense
Planning a trip in December

Is December a good time to visit San Carlos?

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

7.3
Sightseeing
1st-best month of the year
6.5
Beach & pool
2nd-best month of the year

December is one of the better times to visit San Carlos for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Carlos in December

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

In December, San Carlos sees daytime highs around 25°C and nights near 16°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.

sun protectionlight clothesrain gear

Sea temperature near San Carlos in December

The nearest coast averages about 20°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 21 km away) is warmest in February at about 23°C and coldest in July near 12°C.

It's comfortable for a long swim from Dec 12 to Apr 10 — about 3.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb23Refreshing
Mar22Refreshing
Apr20Cool
May17Cool
Jun14Bracing
Jul12Bracing
Aug12Bracing
Sep13Bracing
Oct15Cool
Nov18Cool
Dec20Refreshing

UV index in San Carlos in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Carlos peaks around January 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 17UV 12Jun 18UV 2
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar10Very high
Apr6High
May3Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is San Carlos?

San Carlos sits at 34.8°S, 54.9°W, 28 m above sea level, in Uruguay. The nearest listed city is Maldonado, 12 km away.

PiriapolisMinasRochaLa PalomaPandoBarros Blancos

Topography around San Carlos

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

Within 3 km, the terrain around San Carlos has only modest variations in elevation — a maximum elevation change of 42 m around an average of 11 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 266 m; within 80 km, significant variations in elevation — a maximum elevation change of 498 m.

The land around San Carlos is covered by grassland (45%) and trees (22%) within 3 km, grassland (60%) within 16 km, and grassland (42%) and water (37%) within 80 km.

3 km
42 m
16 km
266 m
80 km
498 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Maldonado 12 km · Punta del Este 17 km · Piriapolis 34 km · Minas 55 km · Rocha 64 km · La Paloma 70 km · Pando 95 km · Barros Blancos 99 km

Uruguay travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / I / L
230 V · 50 Hz
Prices
≈ 66% of US
price level, 2025
GDP per capita
$25,216
2025
Happiness
6.6 / 10
World Happiness, 2025
Homicide rate
11.2
per 100k, 2023
Road deaths
14.8
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 542
Religion
none 47%Roman Catholic 37%Protestant 15%atheist 10%

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 San Carlos (-34.7912°, -54.9182°, elevation 28 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).