Buin weather in December

In December, Buin sees average daytime highs of 27°C and overnight lows near 13°C, with 7 mm of rain across 1.2 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 26°C in the first days to 28°C by the end. The sky is clear or mostly clear about 82% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 06 min at the start of December to 14 h 12 min by month's end. Set against the rest of the year, December is Buin's 4th-clearest and 2nd-windiest month. For the whole year in context, see Buin's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
13°
10th coldest
Rainfall
7 mm
1.2 wet days
Daylight
14 h 12 min
6:32 AM – 8:46 PM
Cloud cover
18%
4th clearest
Wind
6 km/h
2nd windiest
Solar energy
8.83 kWh/m²
Travel score
8.6
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 26°C in the first days to 28°C by the end.

A typical December day in Buin reaches about 27°C in the afternoon and slips back to 13°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, December runs about 3°C warmer than November and about 2°C cooler than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12612
22612
32612
42612
52612
62613
72613
82613
92613
102613
112613
122713
132713
142713
152713
162713
172714
182714
192714
202714
212714
222714
232814
242814
252814
262814
272815
282815
292815
302815
312815

Buin 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° / 15°30.9147.7
Feb28° / 15°4113.38.3
Mar26° / 13°71.112.38.9
Apr22° / 293.111.28.2
May18° / 70610.36.5
Jun15° / 1267.89.84.8
Jul15° / 947.2104.7
Aug16° / 837.410.75.5
Sep18° / 577.211.86.4
Oct21° / 385.212.87.4
Nov24° / 11°152.813.88.7
Dec27° / 13°71.214.28.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 82% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 9%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18812
28812
38812
48812
58812
68911
78911
88911
99010
109010
11919
12919
13919
14919
15919
16919
17919
18928
19937
20937
21937
22937
23928
24928
25928
26928
27937
28937
29937
30937
31937

Chance of precipitation in December

Any precipitation

Buin gets around 7 mm of rain over 1.2 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 4% and peaks near 7% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
17
27
37
47
56
66
76
85
95
105
115
124
134
144
154
163
173
183
193
203
213
223
233
243
253
263
273
283
293
303
313

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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19820
29820
39730
49730
59640
69640
79550
89460
99370
109280
119280
129190
1390100
1489110
1589110
1688120
1787121
1886131
1986131
2085141
2185141
2285141
2385141
2484151
2584151
2684151
2784151
2884151
2983161
3083161
3183161

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 06 min 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 6 minutes over December. Sunrise moves from 6:30 AM to 6:40 AM, and sunset from 8:35 PM to 8:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.16:308:35
214.16:308:36
314.16:308:37
414.16:308:38
514.16:308:38
614.16:308:39
714.26:308:40
814.26:308:41
914.26:318:41
1014.26:318:42
1114.26:318:43
1214.26:318:43
1314.26:318:44
1414.26:328:45
1514.26:328:45
1614.26:328:46
1714.26:338:47
1814.26:338:47
1914.26:338:48
2014.26:348:48
2114.26:348:49
2214.26:358:49
2314.26:358:50
2414.26:368:50
2514.26:368:51
2614.26:378:51
2714.26:378:51
2814.26:388:52
2914.26:388:52
3014.26:398:52
3114.26:408:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 8.83 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 8.83 kWh/m² in December across the year — December's 8.83 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.5Intense
28.5Intense
38.6Intense
48.6Intense
58.6Intense
68.6Intense
78.7Intense
88.7Intense
98.7Intense
108.7Intense
118.7Intense
128.8Intense
138.8Intense
148.8Intense
158.8Intense
168.8Intense
178.8Intense
188.9Intense
198.9Intense
208.9Intense
218.9Intense
228.9Intense
238.9Intense
248.9Intense
259.0Intense
269.0Intense
279.0Intense
289.0Intense
299.0Intense
309.0Intense
319.0Intense
Planning a trip in December

Hazard calendar for Buin

In seasonPeak

None of Buin's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Buin's rainy season runs May–September, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Buin?

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

8.6
Sightseeing
3rd-best month of the year
8.6
Beach & pool
3rd-best month of the year

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

What to pack for Buin in December

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

In December, Buin sees daytime highs around 27°C and nights near 13°C. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

UV index in Buin 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 Buin peaks around January 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateVery highExtremeJan 17UV 13Jun 15UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr5Moderate
May3Moderate
Jun3Moderate
Jul3Moderate
Aug3Moderate
Sep6High
Oct9Very high
Nov10Extreme
Dec12Extreme

Air quality in Buin 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 Buin is worst in July — around 108 µg/m³ PM2.5 (unhealthy), about 3.9× the cleanest month (December, 28 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyPoorModerateJul 16107 µg/m³Dec 2128 µg/m³
PM2.5 (µg/m³)Level
Jan30Moderate
Feb31Moderate
Mar41Poor
Apr56Unhealthy
May80Unhealthy
Jun96Unhealthy
Jul108Unhealthy
Aug95Unhealthy
Sep78Unhealthy
Oct55Poor
Nov35Poor
Dec28Moderate
Location & terrain

Where is Buin?

Buin sits at 33.7°S, 70.7°W, 483 m above sea level, in Chile. The nearest listed city is Paine, 8.0 km away.

Topography around Buin

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

Within 3 km, the terrain around Buin has only modest variations in elevation — a maximum elevation change of 74 m around an average of 473 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,416 m; within 80 km, extreme variations in elevation — a maximum elevation change of 6,085 m.

The land around Buin is covered by cropland (31%) and artificial surfaces (30%) within 3 km, cropland (33%) within 16 km, and shrubs (25%), grassland (23%) and bare terrain (21%) within 80 km.

3 km
74 m
16 km
1,416 m
80 km
6,085 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainsnow and ice
December weather nearby: Paine 8.0 km · San Bernardo 16 km · Talagante 19 km · Peñaflor 19 km · Padre Hurtado 19 km · La Pintana 19 km · Puente Alto 20 km · El Monte 23 km

Chile travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
220 V · 50 Hz
Prices
≈ 48% of US
price level, 2025
GDP per capita
$17,995
2025
Happiness
6.3 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
6.3
per 100k, 2023
Road deaths
14.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 517
Religion
Catholic 57%none 26%Evangelical or Protestant 16%other Christians and traditions related to 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 Buin (-33.7326°, -70.7428°, elevation 483 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).