Gualeguaychú weather in December

In December, Gualeguaychú sees average daytime highs of 29°C and overnight lows near 18°C, with 128 mm of rain across 8.6 wet days and about 14.1 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 28°C in the first days to 30°C by the end. The sky is clear or mostly clear about 50% 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 Gualeguaychú's 2nd-clearest and 6th-windiest month. For the whole year in context, see Gualeguaychú's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
18°
10th coldest
Rainfall
128 mm
8.6 wet days
Daylight
14 h 12 min
5:45 AM – 7:55 PM
Cloud cover
45%
2nd clearest
Wind
12 km/h
6th windiest
Solar energy
7.34 kWh/m²
Travel score
5.9
out of 10

Gualeguaychú is city in Gualeguaychú Department, Entre Ríos Province, Argentina.

Founded
1783

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 28°C in the first days to 30°C by the end.

A typical December day in Gualeguaychú reaches about 29°C in the afternoon and slips back to 18°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 34°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)
12816
22817
32817
42817
52817
62817
72817
82817
92817
102917
112917
122917
132917
142918
152918
162918
172918
182918
192918
202918
212918
223018
233019
243019
253019
263019
273019
283019
293019
303019
313019

Gualeguaychú weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 19°1107.713.95.3
Feb29° / 19°115813.25.8
Mar27° / 17°121812.37.0
Apr23° / 14°1307.911.27.3
May20° / 11°806.110.36.8
Jun17° / 696.59.95.8
Jul16° / 646105.6
Aug18° / 876.510.86.6
Sep20° / 10°87711.86.9
Oct23° / 13°1249.812.87.0
Nov26° / 15°1046.913.77.2
Dec29° / 18°1288.614.15.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 38%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36139
46139
56238
66238
76238
86337
96436
106436
116436
126436
136436
146436
156436
166337
176337
186337
196238
206238
216238
226139
236139
246139
256040
266040
276139
286139
296139
306238
316238

Chance of precipitation in December

Any precipitation

Gualeguaychú gets around 128 mm of rain over 8.6 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 28% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
126
226
326
426
526
626
726
827
927
1027
1127
1227
1328
1428
1529
1629
1729
1829
1929
2029
2129
2229
2329
2429
2529
2629
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 29% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13229261120
23228271220
33128271220
43127281220
53127281320
63026281320
73026291420
82925291420
92825301520
102725301520
112625301620
122525311730
132425311730
142325311830
152224311930
162124312030
172024312140
181924312240
191823312350
201723302450
211722302560
221622292570
231622292680
241521282790
251521272790
2614202728100
2714202628111
2814202529121
2913202529131
3013192529131
3113192429141

Wind in December

Winds average 12 km/h in December.

Across December, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
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
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light 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 5:43 AM to 5:53 AM, and sunset from 7:44 PM to 8:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:437:44
214.05:437:45
314.05:437:46
414.15:437:47
514.15:437:48
614.15:437:48
714.15:437:49
814.15:437:50
914.15:447:51
1014.15:447:51
1114.15:447:52
1214.15:447:53
1314.25:447:53
1414.25:457:54
1514.25:457:55
1614.25:457:55
1714.25:467:56
1814.25:467:56
1914.25:467:57
2014.25:477:57
2114.25:477:58
2214.25:487:58
2314.25:487:59
2414.25:497:59
2514.25:498:00
2614.25:508:00
2714.25:508:01
2814.25:518:01
2914.25:518:01
3014.25:528:01
3114.25:538:02

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.34 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 7.34 kWh/m² in December across the year — December's 7.34 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.2Intense
27.3Intense
37.3Intense
47.3Intense
57.3Intense
67.3Intense
77.3Intense
87.3Intense
97.3Intense
107.3Intense
117.3Intense
127.3Intense
137.3Intense
147.3Intense
157.3Intense
167.3Intense
177.3Intense
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 Gualeguaychú?

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

5.9
Sightseeing
8th-best month of the year
7.4
Beach & pool
2nd-best month of the year

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

What to pack for Gualeguaychú in December

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

In December, Gualeguaychú sees daytime highs around 29°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 9 days see rain.

light clothessun protectionrain gear

UV index in Gualeguaychú 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 Gualeguaychú peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 20UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Gualeguaychú?

Gualeguaychú sits at 33.0°S, 58.5°W, 19 m above sea level, in Argentina. The nearest listed city is Fray Bentos, 23 km away.

Topography around Gualeguaychú

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

Within 3 km, the terrain around Gualeguaychú has only modest variations in elevation — a maximum elevation change of 33 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, only modest variations in elevation — a maximum elevation change of 101 m.

The land around Gualeguaychú is covered by artificial surfaces (40%) and grassland (31%) within 3 km, grassland (40%) and cropland (31%) within 16 km, and cropland (43%) and grassland (30%) within 80 km.

3 km
33 m
16 km
52 m
80 km
101 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Fray Bentos 23 km · Mercedes 53 km · Concepción del Uruguay 64 km · Dolores 64 km · Gualeguay 75 km · Paysandú 87 km · Young 90 km · Colón 94 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus Christ 1%

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 Gualeguaychú (-33.0078°, -58.5184°, elevation 19 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).