Treinta y Tres weather in December

In December, Treinta y Tres sees average daytime highs of 28°C and overnight lows near 16°C, with 87 mm of rain across 8.4 wet days and about 14.2 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 29°C by the end. The sky is clear or mostly clear about 41% of the time in December, and the air most often feels humid.

Daylight stretches from about 14 hours at the start of December to 14 h 12 min by month's end. Set against the rest of the year, December is Treinta y Tres's 1st-clearest and 5th-windiest month. For the whole year in context, see Treinta y Tres's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
16°
9th coldest
Rainfall
87 mm
8.4 wet days
Daylight
14 h 12 min
6:28 AM – 8:39 PM
Cloud cover
52%
1st clearest
Wind
13 km/h
5th windiest
Solar energy
7 kWh/m²
Travel score
6.6
out of 10

Treinta y Tres is city of Treinta y Tres Department, Uruguay.

Density
1,429/km²
people per km²
Founded
1853

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 27°C in the first days to 29°C by the end.

A typical December day in Treinta y Tres reaches about 28°C in the afternoon and slips back to 16°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 32°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)
12615
22615
32715
42715
52715
62715
72715
82715
92716
102716
112716
122716
132716
142816
152816
162816
172816
182816
192817
202817
212817
222817
232817
242817
252817
262917
272917
282917
292918
302918
312918

Treinta y Tres weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°838.513.95.8
Feb28° / 18°948.913.26.1
Mar27° / 16°828.712.36.8
Apr23° / 14°1088.711.27.0
May19° / 10°97710.36.6
Jun17° / 918.19.85.5
Jul16° / 898105.3
Aug18° / 1038.210.86.1
Sep19° / 998.611.86.3
Oct22° / 12°1121012.86.6
Nov25° / 14°928.113.77.2
Dec28° / 16°878.414.26.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55446
65347
75347
85347
95446
105446
115446
125347
135446
145446
155446
165545
175446
185446
195446
205545
215545
225446
235446
245446
255446
265545
275545
285545
295545
305545
315545

Chance of precipitation in December

Any precipitation

Treinta y Tres gets around 87 mm of rain over 8.4 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 (%)
127
226
326
426
526
626
726
827
927
1027
1127
1228
1328
1428
1529
1629
1729
1829
1929
2029
2129
2228
2328
2427
2526
2626
2725
2825
2925
3024
3124

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 23% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1342925121
2342925121
3342925111
4342926111
5332926111
6322827111
7322827121
8312828121
9302829121
10292829131
11282830131
12262830142
13252830152
14242831162
15232831172
16222731182
17212730193
18202630213
19192630223
20182530234
21172430244
22172329265
23162229276
24162228286
25162128287
26162028297
27152027308
28151927308
29151927309
30141927319
31141927319

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 hours at the start of December to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 6:26 AM to 6:36 AM, and sunset from 8:28 PM to 8:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.06:268:28
214.16:268:29
314.16:268:30
414.16:268:31
514.16:268:32
614.16:268:32
714.16:268:33
814.16:268:34
914.16:268:35
1014.16:278:35
1114.26:278:36
1214.26:278:37
1314.26:278:37
1414.26:278:38
1514.26:288:39
1614.26:288:39
1714.26:288:40
1814.26:298:40
1914.26:298:41
2014.26:308:42
2114.26:308:42
2214.26:318:43
2314.26:318:43
2414.26:318:43
2514.26:328:44
2614.26:338:44
2714.26:338:45
2814.26:348:45
2914.26:348:45
3014.26:358:46
3114.26:368:46

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.21 kWh/m² to a high of 7 kWh/m² in December across the year — December's 7 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
37.0Intense
47.0Intense
57.0Intense
67.1Intense
77.1Intense
87.0Intense
97.0Intense
107.0Intense
117.0Intense
127.0Intense
137.0Intense
147.0Intense
157.0Intense
167.0Intense
176.9Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.9Intense
266.9Intense
277.0Intense
287.0Intense
297.0Intense
307.0Intense
317.0Intense
Planning a trip in December

Is December a good time to visit Treinta y Tres?

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

6.6
Sightseeing
4th-best month of the year
7.1
Beach & pool
2nd-best month of the year

December is a reasonable time to visit Treinta y Tres for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Treinta y Tres in December

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

In December, Treinta y Tres sees daytime highs around 28°C and nights near 16°C. Pack light clothes and sun protection. Worth having: rain gear. About 8 days see rain.

light clothessun protectionrain gear

UV index in Treinta y Tres 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 Treinta y Tres peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 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 highModerateHighVery highExtremeJan 15UV 13Jun 18UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Treinta y Tres?

Treinta y Tres sits at 33.2°S, 54.4°W, 55 m above sea level, in Uruguay. The nearest listed city is Melo, 98 km away.

MeloSanta Vitória do PalmarJaguarãoRochaMinasLa PalomaArroio GrandeSan Carlos

Topography around Treinta y Tres

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Treinta y Tres.

Within 3 km, the terrain around Treinta y Tres has only modest variations in elevation — a maximum elevation change of 44 m around an average of 40 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 144 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Treinta y Tres is covered by grassland (38%), trees (35%) and artificial surfaces (24%) within 3 km, grassland (72%) within 16 km, and grassland (69%) within 80 km.

3 km
44 m
16 km
144 m
80 km
375 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Melo 98 km · Santa Vitória do Palmar 100 km · Jaguarão 120 km · Rocha 139 km · Minas 150 km · La Paloma 161 km · Arroio Grande 164 km · San Carlos 180 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 Treinta y Tres (-33.231°, -54.3858°, elevation 55 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).