Rancagua weather in December

In December, Rancagua sees average daytime highs of 25°C and overnight lows near 12°C, with 13 mm of rain across 2 wet days and about 14.2 hours of daylight. It is the 3rd-warmest and 9th-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 79% 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 18 min by month's end. Set against the rest of the year, December is Rancagua's 4th-clearest and 2nd-windiest month. For the whole year in context, see Rancagua's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
13 mm
2 wet days
Daylight
14 h 18 min
6:31 AM – 8:47 PM
Cloud cover
21%
4th clearest
Wind
5 km/h
2nd windiest
Solar energy
8.8 kWh/m²
Travel score
8.9
out of 10

Rancagua is city in O'Higgins Region, Chile.

Air quality
High
PM2.5 25.9 µg/m³ · 2019
Density
4,021/km²
people per km²
Founded
1743

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 Rancagua reaches about 25°C in the afternoon and slips back to 12°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 28°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°151015202531
Avg high (°C)Avg low (°C)
12310
22410
32410
42410
52410
62410
72411
82411
92411
102411
112411
122411
132411
142511
152511
162512
172512
182512
192512
202512
212512
222512
232513
242513
252513
262613
272613
282613
292613
302613
312613

Rancagua weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan26° / 14°61.40148.9
Feb26° / 13°71.5013.38.9
Mar24° / 11°111.8012.39.1
Apr20° / 443.9011.27.7
May17° / 997.30.110.25.7
Jun14° / 1679.41.49.83.9
Jul13° / 1249.21.5103.9
Aug15° / 1088.61.210.74.7
Sep17° / 81100.411.85.5
Oct19° / 608.50.212.96.6
Nov22° / 264.7013.88.0
Dec25° / 12°132014.28.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 79% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 12%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18416
28416
38416
48416
58416
68515
78614
88614
98614
108713
118812
128812
138911
148911
159010
169010
179010
189010
199010
209010
219010
229010
239010
249010
259010
269010
27919
28919
29919
30928
31928

Chance of precipitation in December

Any precipitation

Rancagua gets around 13 mm of rain over 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 7% and peaks near 12% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
112
212
311
411
511
610
710
89
99
108
117
127
136
146
156
165
175
185
194
204
214
224
234
244
254
265
275
285
295
305
315

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 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29820
39820
49820
59730
69730
79640
89550
99460
109460
119370
129280
139190
149190
1590100
1690100
1789110
1889110
1988120
2087121
2187121
2286131
2386131
2486131
2586131
2686131
2786131
2886131
2986131
3086131
3186131

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
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 18 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 6:29 AM to 6:39 AM, and sunset from 8:36 PM to 8:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.16:298:36
214.16:298:37
314.16:298:38
414.26:298:39
514.26:298:39
614.26:298:40
714.26:298:41
814.26:298:42
914.26:298:42
1014.26:308:43
1114.26:308:44
1214.26:308:45
1314.36:308:45
1414.36:308:46
1514.36:318:47
1614.36:318:47
1714.36:318:48
1814.36:328:48
1914.36:328:49
2014.36:338:49
2114.36:338:50
2214.36:338:50
2314.36:348:51
2414.36:348:51
2514.36:358:52
2614.36:368:52
2714.36:368:52
2814.36:378:53
2914.36:378:53
3014.36:388:53
3114.36:398:54

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 8.8 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 8.81 kWh/m² in January across the year — December's 8.8 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.5Intense
28.5Intense
38.5Intense
48.5Intense
58.6Intense
68.6Intense
78.6Intense
88.6Intense
98.7Intense
108.7Intense
118.7Intense
128.7Intense
138.8Intense
148.8Intense
158.8Intense
168.8Intense
178.8Intense
188.8Intense
198.9Intense
208.9Intense
218.9Intense
228.9Intense
238.9Intense
248.9Intense
258.9Intense
269.0Intense
279.0Intense
289.0Intense
299.0Intense
309.0Intense
319.0Intense
Planning a trip in December

Hazard calendar for Rancagua

In seasonPeak

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

Rancagua'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 Rancagua?

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

8.9
Sightseeing
2nd-best month of the year
7.8
Beach & pool
3rd-best month of the year

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

What to pack for Rancagua in December

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

In December, Rancagua sees daytime highs around 25°C and nights near 12°C. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

UV index in Rancagua 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 Rancagua peaks around January 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near May 24 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 16UV 13May 24UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr5High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug3Moderate
Sep6High
Oct9Very high
Nov11Extreme
Dec12Extreme

Air quality in Rancagua 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 Rancagua is worst in July — around 35 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (December, 17 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Rancagua's WHO annual average of 25.9 µg/m³.

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateJul 1835 µg/m³Dec 1217 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb19Moderate
Mar18Moderate
Apr25Moderate
May34Moderate
Jun34Moderate
Jul35Poor
Aug34Moderate
Sep31Moderate
Oct24Moderate
Nov18Moderate
Dec17Moderate
Location & terrain

Where is Rancagua?

Rancagua sits at 34.2°S, 70.7°W, 520 m above sea level, in Chile. The nearest listed city is Machalí, 8.0 km away.

Topography around Rancagua

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

Within 3 km, the terrain around Rancagua has only modest variations in elevation — a maximum elevation change of 70 m around an average of 502 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,373 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,124 m.

The land around Rancagua is covered by artificial surfaces (74%) within 3 km, shrubs (28%), cropland (25%) and trees (22%) within 16 km, and bare terrain (24%) and trees (20%) within 80 km.

3 km
70 m
16 km
1,373 m
80 km
5,124 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainsnow and icewater
December weather nearby: Machalí 8.0 km · Graneros 11 km · Rengo 29 km · Paine 40 km · San Vicente 43 km · San Vicente de Tagua Tagua 43 km · Buin 49 km · Talagante 59 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 Rancagua (-34.1691°, -70.7405°, elevation 520 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).