Santiago weather in December

In December, Santiago sees average daytime highs of 29°C and overnight lows near 18°C, with 169 mm of rain across 12.2 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 41% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 42 min at the start of December to 13 h 48 min by month's end. Set against the rest of the year, December is Santiago's 6th-clearest and 7th-windiest month. For the whole year in context, see Santiago's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
18°
10th coldest
Rainfall
169 mm
12.2 wet days
Daylight
13 h 54 min
6:40 AM – 8:31 PM
Cloud cover
53%
6th clearest
Wind
11 km/h
7th windiest
Solar energy
6.78 kWh/m²
Travel score
5.1
out of 10

Santiago is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical December day in Santiago 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 25°C and 34°C. Set against its neighbours, December runs about 2°C warmer than November and on par with January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12917
22917
32918
42918
52918
62918
72918
82918
92918
102918
112918
122918
132918
142918
152918
162918
173019
183019
193019
203019
213019
223019
233019
243019
253019
263019
273019
283019
293019
303019
313020

Santiago weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 20°17414.213.74.6
Feb29° / 19°15413.4134.9
Mar28° / 18°14411.712.25.9
Apr25° / 15°16110.511.36.8
May21° / 12°1259.410.66.6
Jun19° / 10°1369.910.26.1
Jul19° / 1509.910.36.2
Aug21° / 11°1309.2116.8
Sep22° / 12°16010.511.86.6
Oct25° / 15°23612.612.76.5
Nov27° / 16°15510.413.56.4
Dec29° / 18°16912.213.85.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% 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 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35842
45842
55743
65743
75743
85743
95743
105743
115743
125644
135644
145644
155644
165644
175644
185644
195545
205545
215545
225545
235644
245644
255644
265644
275644
285644
295743
305743
315743

Chance of precipitation in December

Any precipitation

Santiago gets around 169 mm of rain over 12.2 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 39% and peaks near 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
536
636
737
837
937
1037
1137
1237
1337
1438
1538
1639
1739
1840
1940
2040
2141
2241
2341
2442
2542
2642
2742
2842
2942
3042
3142

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1162529274
2162429274
3162429284
4162328284
5162328294
6162228295
7162228305
8152128305
9152128316
10152128316
11142028317
12142027327
13132027328
14121927338
15121927339
161118273410
171018273411
181018263512
19917263513
20917253514
21817253615
22717243616
23717233617
24617233618
25616233619
26616223520
27516223521
28516223522
29516223423
30516223423
31415223424

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 42 min at the start of December to 13 h 48 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 6:37 AM to 6:47 AM, and sunset from 8:21 PM to 8:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.76:378:21
213.76:378:22
313.86:378:23
413.86:378:23
513.86:378:24
613.86:388:25
713.86:388:26
813.86:388:26
913.86:388:27
1013.86:388:28
1113.86:388:28
1213.86:398:29
1313.86:398:30
1413.86:398:30
1513.96:408:31
1613.96:408:31
1713.96:408:32
1813.96:418:32
1913.96:418:33
2013.96:418:34
2113.96:428:34
2213.96:428:35
2313.96:438:35
2413.96:438:35
2513.96:448:36
2613.96:448:36
2713.96:458:37
2813.96:468:37
2913.96:468:37
3013.86:478:38
3113.86:478:38

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.78 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.52 kWh/m² to a high of 6.78 kWh/m² in December across the year — December's 6.78 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.8Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.8Intense
206.7Intense
216.7Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.7Intense
276.7Intense
286.7Intense
296.7Intense
306.7Intense
316.7Intense
Planning a trip in December

Is December a good time to visit Santiago?

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

5.1
Sightseeing
10th-best month of the year
6.7
Beach & pool
1st-best month of the year

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

What to pack for Santiago in December

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

In December, Santiago sees daytime highs around 29°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.

light clothessun protectionrain gear

UV index in Santiago 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 Santiago peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighExtremeJan 20UV 14Jun 19UV 3
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar10Extreme
Apr8Very high
May5Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep8Very high
Oct6High
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Santiago?

Santiago sits at 29.2°S, 54.9°W, 426 m above sea level, in Brazil. The nearest listed city is São Francisco de Assis, 47 km away.

Topography around Santiago

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

Within 3 km, the terrain around Santiago has only modest variations in elevation — a maximum elevation change of 127 m around an average of 392 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 285 m; within 80 km, significant variations in elevation — a maximum elevation change of 475 m.

The land around Santiago is covered by grassland (39%), artificial surfaces (31%) and trees (26%) within 3 km, grassland (53%) and trees (27%) within 16 km, and cropland (41%), grassland (38%) and trees (20%) within 80 km.

3 km
127 m
16 km
285 m
80 km
475 m
treesgrasslandcroplandartificial surfaces
December weather nearby: São Francisco de Assis 47 km · São Pedro do Sul 82 km · São Luiz Gonzaga 88 km · Tupanciretã 101 km · Alegrete 111 km · Júlio de Castilhos 115 km · Santo Ângelo 115 km · Santa Maria 116 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 Santiago (-29.1917°, -54.8672°, elevation 426 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).