Bahía Blanca weather in December

In December, Bahía Blanca sees average daytime highs of 26°C and overnight lows near 17°C, with 57 mm of rain across 6.2 wet days and about 14.7 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 25°C in the first days to 28°C by the end. The sky is clear or mostly clear about 59% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 30 min at the start of December to 14 h 42 min by month's end. Set against the rest of the year, December is Bahía Blanca's 3rd-clearest and 1st-windiest month. For the whole year in context, see Bahía Blanca's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
57 mm
6.2 wet days
Daylight
14 h 42 min
5:44 AM – 8:26 PM
Cloud cover
36%
3rd clearest
Wind
20 km/h
1st windiest
Solar energy
7.89 kWh/m²
Travel score
7.6
out of 10

Bahía Blanca is city in Argentina.

Density
2,301/km²
people per km²
Founded
1828

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 25°C in the first days to 28°C by the end.

A typical December day in Bahía Blanca reaches about 26°C in the afternoon and slips back to 17°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°C. Set against its neighbours, December runs about 3°C warmer than November and about 2°C cooler than January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12515
22515
32515
42515
52515
62516
72516
82516
92616
102616
112616
122616
132616
142616
152617
162617
172717
182717
192717
202717
212717
222717
232718
242718
252818
262818
272818
282818
292818
302818
312818

Bahía Blanca weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 18°547.114.47.3
Feb27° / 18°656.713.57.4
Mar24° / 16°676.712.37.7
Apr20° / 12°556117.1
May16° / 385.49.95.6
Jun13° / 284.49.34.1
Jul12° / 3459.63.7
Aug14° / 354.810.54.7
Sep16° / 456.211.75.7
Oct19° / 11°647.8136.7
Nov23° / 14°63714.17.6
Dec26° / 17°576.214.77.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% 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 25%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17327
27426
37426
47426
57426
67426
77426
87426
97426
107426
117426
127426
137426
147525
157525
167525
177525
187525
197624
207624
217624
227624
237624
247723
257723
267723
277723
287723
297723
307723
317822

Chance of precipitation in December

Any precipitation

Bahía Blanca gets around 57 mm of rain over 6.2 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 20% and peaks near 21% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
121
221
321
421
521
621
721
820
920
1020
1120
1220
1320
1419
1519
1619
1719
1819
1919
2019
2119
2219
2319
2419
2519
2619
2719
2819
2919
3019
3120

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 66% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1761770
2761770
3741781
4741781
5741781
6731881
7731881
8721981
9721981
10721981
11712081
12712081
13712081
14702181
15702181
16702181
17672292
18672292
196523102
206423103
216224113
226124123
235924134
245824144
255724154
265425165
275325175
285225185
295125195
305125195
315025205

Wind in December

Winds average 20 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 20 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
120light breeze
220light breeze
320light breeze
420light breeze
520light breeze
620breezy
720breezy
820breezy
920breezy
1020breezy
1120breezy
1220breezy
1320breezy
1420breezy
1520breezy
1620breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2720breezy
2820breezy
2920breezy
3020breezy
3120breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 30 min at the start of December to 14 h 42 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 5:44 AM to 5:52 AM, and sunset from 8:14 PM to 8:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:448:14
214.55:438:15
314.55:438:16
414.65:438:17
514.65:438:18
614.65:438:19
714.65:438:19
814.65:438:20
914.65:438:21
1014.65:438:22
1114.75:438:23
1214.75:438:23
1314.75:448:24
1414.75:448:25
1514.75:448:25
1614.75:448:26
1714.75:458:27
1814.75:458:27
1914.75:458:28
2014.75:468:28
2114.75:468:29
2214.75:478:29
2314.75:478:30
2414.75:488:30
2514.75:488:31
2614.75:498:31
2714.75:498:31
2814.75:508:32
2914.75:518:32
3014.75:518:32
3114.75:528:32

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.89 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 7.89 kWh/m² in December across the year — December's 7.89 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.7Intense
27.7Intense
37.8Intense
47.8Intense
57.8Intense
67.8Intense
77.8Intense
87.8Intense
97.8Intense
107.8Intense
117.8Intense
127.8Intense
137.9Intense
147.9Intense
157.9Intense
167.9Intense
177.9Intense
187.9Intense
197.9Intense
208.0Intense
218.0Intense
228.0Intense
238.0Intense
248.0Intense
258.0Intense
268.0Intense
278.0Intense
288.0Intense
298.0Intense
308.0Intense
317.9Intense
Planning a trip in December

Is December a good time to visit Bahía Blanca?

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

7.6
Sightseeing
2nd-best month of the year
7.4
Beach & pool
2nd-best month of the year

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

What to pack for Bahía Blanca in December

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

In December, Bahía Blanca sees daytime highs around 26°C and nights near 17°C. Pack sun protection. Worth having: light clothes and a windbreaker. About 6 days see rain.

sun protectionlight clothesa windbreaker

Sea temperature near Bahía Blanca in December

The nearest coast averages about 21°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 January at about 22°C and coldest in August near 9°C.

It's comfortable for a long swim from Dec 8 to Mar 20 — about 3.4 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar21Refreshing
Apr17Cool
May14Bracing
Jun11Bracing
Jul9Bracing
Aug9Bracing
Sep11Bracing
Oct15Bracing
Nov18Cool
Dec21Refreshing

UV index in Bahía Blanca 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 Bahía Blanca peaks around December 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateModerateVery highExtremeDec 20UV 12Jun 21UV 2
UV index (midday)Level
Jan12Extreme
Feb11Extreme
Mar8Very high
Apr6High
May3Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep5Moderate
Oct7Very high
Nov10Extreme
Dec13Extreme
Location & terrain

Where is Bahía Blanca?

Bahía Blanca sits at 38.7°S, 62.3°W, 20 m above sea level, in Argentina. The nearest listed city is Punta Alta, 25 km away.

Carmen de PatagonesViedma

Topography around Bahía Blanca

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

Within 3 km, the terrain around Bahía Blanca has only modest variations in elevation — a maximum elevation change of 67 m around an average of 26 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 110 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,244 m.

The land around Bahía Blanca is covered by artificial surfaces (80%) within 3 km, grassland (33%) and cropland (23%) within 16 km, and cropland (39%) and grassland (37%) within 80 km.

3 km
67 m
16 km
110 m
80 km
1,244 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Punta Alta 25 km · Coronel Pringles 114 km · Pigüé 125 km · Coronel Suárez 143 km · Río Colorado 161 km · Tres Arroyos 177 km · Carmen de Patagones 240 km · Viedma 242 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 Bahía Blanca (-38.7176°, -62.2655°, elevation 20 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).