Santiago weather in December

In December, Santiago sees average daytime highs of 18°C and overnight lows near 7°C, with 47 mm of precipitation across 7.1 wet days and about 10.4 hours of daylight. It is the 11th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 17°C by the end. The sky is clear or mostly clear about 47% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 30 min at the start of December to 10 h 24 min by month's end. Set against the rest of the year, December is Santiago's 7th-clearest and 10th-windiest month. For the whole year in context, see Santiago's year-round climate.

Daytime high: 18°; 11th warmest
Overnight low: 7°; 2nd coldest
Precipitation: 47 mm; 7.1 wet days
Daylight: 10 h 24 min; 7:24 AM – 5:49 PM
Cloud cover: 48%; 7th clearest
Wind: 5 km/h; 10th windiest
Solar energy: 3.73 kWh/m²
Travel score: 6.3; out of 10

Santiago is municipal seat of Santiago, State of Nuevo León, Mexico.

Founded: 1648

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

← November Santiago year-round climate January →Best places to visit in December

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 17°C by the end.

A typical December day in Santiago reaches about 18°C in the afternoon and slips back to 7°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 24°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	19	19	19	19	19	18	18	18	18	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	8	8	8	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6	6

	Avg high (°C)	Avg low (°C)
1	19	8
2	19	8
3	19	8
4	19	8
5	19	8
6	18	8
7	18	8
8	18	8
9	18	8
10	18	8
11	18	7
12	18	7
13	18	7
14	18	7
15	18	7
16	18	7
17	18	7
18	18	7
19	18	7
20	17	7
21	17	7
22	17	7
23	17	7
24	17	7
25	17	7
26	17	6
27	17	6
28	17	6
29	17	6
30	17	6
31	17	6

Santiago weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 12th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	17° / 7°	60	9.3	10.6	5.9
Feb	20° / 8°	84	10.1	11.1	6.3
Mar	22° / 11°	131	14.2	11.8	6.2
Apr	25° / 14°	172	15.6	12.6	6.1
May	27° / 16°	158	16	13.2	5.9
Jun	28° / 18°	87	11	13.6	6.0
Jul	29° / 18°	88	10.4	13.4	5.8
Aug	29° / 18°	68	10.4	12.9	5.9
Sep	26° / 17°	191	16.2	12.2	5.8
Oct	24° / 14°	107	11.1	11.4	7.0
Nov	20° / 10°	66	9.2	10.8	6.7
Dec	18° / 7°	47	7.1	10.4	6.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 42%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	62	60	60	59	59	58	58	58	58	58	58	58	58	59	59	58	59	59	58	59	59	58	58	57	57	57	57	56	57	56	56
Cloudier (%)	38	40	40	41	41	42	42	42	42	42	42	42	42	41	41	42	41	41	42	41	41	42	42	43	43	43	43	44	43	44	44

	Clearer (%)	Cloudier (%)
1	62	38
2	60	40
3	60	40
4	59	41
5	59	41
6	58	42
7	58	42
8	58	42
9	58	42
10	58	42
11	58	42
12	58	42
13	58	42
14	59	41
15	59	41
16	58	42
17	59	41
18	59	41
19	58	42
20	59	41
21	59	41
22	58	42
23	58	42
24	57	43
25	57	43
26	57	43
27	57	43
28	56	44
29	57	43
30	56	44
31	56	44

Chance of precipitation in December

Any precipitation

Santiago gets around 47 mm of rain and snow over 7.1 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 24% and peaks near 26% on the wettest days, and about 0 day brings snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	22	22	22	22	21	21	22	22	22	22	22	23	23	23	24	24	24	24	24	25	25	25	25	25	25	25	25	25	25	26	26

	Rain chance (%)
1	22
2	22
3	22
4	22
5	21
6	21
7	22
8	22
9	22
10	22
11	22
12	23
13	23
14	23
15	24
16	24
17	24
18	24
19	24
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	26
31	26

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 93% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	86	87	87	87	89	89	89	90	90	90	91	91	91	92	92	93	93	94	94	95	95	96	96	96	97	97	98	98	98	98	98
Comfortable (%)	13	12	12	12	11	11	11	10	10	10	9	9	9	8	8	7	7	6	6	5	5	4	4	4	3	3	2	2	2	2	2
Humid (%)	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)
1	86	13	1
2	87	12	1
3	87	12	1
4	87	12	1
5	89	11	0
6	89	11	0
7	89	11	0
8	90	10	0
9	90	10	0
10	90	10	0
11	91	9	0
12	91	9	0
13	91	9	0
14	92	8	0
15	92	8	0
16	93	7	0
17	93	7	0
18	94	6	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	96	4	0
25	97	3	0
26	97	3	0
27	98	2	0
28	98	2	0
29	98	2	0
30	98	2	0
31	98	2	0

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 5 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm
31	5	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 30 min at the start of December to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:14 AM to 7:31 AM, and sunset from 5:46 PM to 5:57 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	10.5	10.5	10.5	10.5	10.5	10.5	10.5	10.5	10.5	10.5	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4
Sunrise (AM)	7:14	7:15	7:16	7:17	7:17	7:18	7:19	7:19	7:20	7:20	7:21	7:22	7:22	7:23	7:24	7:24	7:25	7:25	7:26	7:26	7:27	7:27	7:28	7:28	7:29	7:29	7:29	7:30	7:30	7:30	7:31
Sunset (PM)	5:46	5:46	5:46	5:47	5:47	5:47	5:47	5:47	5:47	5:48	5:48	5:48	5:48	5:49	5:49	5:49	5:50	5:50	5:51	5:51	5:52	5:52	5:52	5:53	5:53	5:54	5:55	5:55	5:56	5:56	5:57

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.5	7:14	5:46
2	10.5	7:15	5:46
3	10.5	7:16	5:46
4	10.5	7:17	5:47
5	10.5	7:17	5:47
6	10.5	7:18	5:47
7	10.5	7:19	5:47
8	10.5	7:19	5:47
9	10.5	7:20	5:47
10	10.5	7:20	5:48
11	10.4	7:21	5:48
12	10.4	7:22	5:48
13	10.4	7:22	5:48
14	10.4	7:23	5:49
15	10.4	7:24	5:49
16	10.4	7:24	5:49
17	10.4	7:25	5:50
18	10.4	7:25	5:50
19	10.4	7:26	5:51
20	10.4	7:26	5:51
21	10.4	7:27	5:52
22	10.4	7:27	5:52
23	10.4	7:28	5:52
24	10.4	7:28	5:53
25	10.4	7:29	5:53
26	10.4	7:29	5:54
27	10.4	7:29	5:55
28	10.4	7:30	5:55
29	10.4	7:30	5:56
30	10.4	7:30	5:56
31	10.4	7:31	5:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.73 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.73 kWh/m² to a high of 6.76 kWh/m² in June across the year — December's 3.73 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	3.8	3.8	3.8	3.8	3.8	3.8	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.8
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.8	Moderate
4	3.8	Moderate
5	3.8	Moderate
6	3.8	Moderate
7	3.7	Moderate
8	3.7	Moderate
9	3.7	Moderate
10	3.7	Moderate
11	3.7	Moderate
12	3.7	Moderate
13	3.7	Moderate
14	3.7	Moderate
15	3.7	Moderate
16	3.7	Moderate
17	3.7	Moderate
18	3.7	Moderate
19	3.7	Moderate
20	3.7	Moderate
21	3.7	Moderate
22	3.7	Moderate
23	3.7	Moderate
24	3.7	Moderate
25	3.7	Moderate
26	3.7	Moderate
27	3.7	Moderate
28	3.7	Moderate
29	3.7	Moderate
30	3.7	Moderate
31	3.8	Moderate

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).

6.3

Sightseeing

3rd-best month of the year

2.0

Beach & pool

11th-best month of the year

December is a reasonable time to visit Santiago for sightseeing.

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 18°C and nights near 7°C. Worth packing: a warm layer. About 7 days see rain.

a warm layer

UV index in Santiago in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santiago peaks around June 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 5 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	5	7	9	11	11	12	11	12	9	8	6	5
Level	High	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	High	Moderate

	UV index (midday)	Level
Jan	5	High
Feb	7	Very high
Mar	9	Very high
Apr	11	Extreme
May	11	Extreme
Jun	12	Extreme
Jul	11	Extreme
Aug	12	Extreme
Sep	9	Very high
Oct	8	Very high
Nov	6	High
Dec	5	Moderate

Air quality in Santiago 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 Santiago is worst in December — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	23	21	24	21	22	20	19	18	20	20	22	24
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	21	Moderate
Mar	24	Moderate
Apr	21	Moderate
May	22	Moderate
Jun	20	Moderate
Jul	19	Moderate
Aug	18	Moderate
Sep	20	Moderate
Oct	20	Moderate
Nov	22	Moderate
Dec	24	Moderate

Location & terrain

Where is Santiago?

Santiago sits at 25.4°N, 100.2°W, 486 m above sea level, in Mexico. The nearest listed city is Ciudad de Allende, 21 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 significant variations in elevation — a maximum elevation change of 452 m around an average of 513 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,598 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,555 m.

The land around Santiago is covered by trees (68%) within 3 km, trees (81%) within 16 km, and shrubs (47%) and trees (36%) within 80 km.

3 km

452 m

trees 68%

16 km

2,598 m

trees 81%

80 km

3,555 m

shrubs 47%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← November Santiago year-round climate January →Best places to visit in December

December weather nearby: Ciudad de Allende 21 km · Jardines de la Silla 23 km · Cadereyta Jiménez 24 km · Cadereyta 24 km · Ciudad Benito Juárez 25 km · Guadalupe 30 km · Monterrey 33 km · San Pedro Garza García 36 km

Mexico travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type A / B; 120 / 127 V · 60 Hz
Prices: ≈ 54% of US; price level, 2025
GDP per capita: $13,889; 2025
Happiness: 7.0 / 10; World Happiness, 2025
Safe drinking water: 43%; of population, 2024
Homicide rate: 24.9; per 100k, 2023
Road deaths: 12.8; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Very low; EF EPI 440
Religion

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 (25.426°, -100.154°, elevation 486 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).

	Avg high (°C)	Avg low (°C)
1	19	8
2	19	8
3	19	8
4	19	8
5	19	8
6	18	8
7	18	8
8	18	8
9	18	8
10	18	8
11	18	7
12	18	7
13	18	7
14	18	7
15	18	7
16	18	7
17	18	7
18	18	7
19	18	7
20	17	7
21	17	7
22	17	7
23	17	7
24	17	7
25	17	7
26	17	6
27	17	6
28	17	6
29	17	6
30	17	6
31	17	6

	Clearer (%)	Cloudier (%)
1	62	38
2	60	40
3	60	40
4	59	41
5	59	41
6	58	42
7	58	42
8	58	42
9	58	42
10	58	42
11	58	42
12	58	42
13	58	42
14	59	41
15	59	41
16	58	42
17	59	41
18	59	41
19	58	42
20	59	41
21	59	41
22	58	42
23	58	42
24	57	43
25	57	43
26	57	43
27	57	43
28	56	44
29	57	43
30	56	44
31	56	44

	Rain chance (%)
1	22
2	22
3	22
4	22
5	21
6	21
7	22
8	22
9	22
10	22
11	22
12	23
13	23
14	23
15	24
16	24
17	24
18	24
19	24
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	26
31	26

	Dry (%)	Comfortable (%)	Humid (%)
1	86	13	1
2	87	12	1
3	87	12	1
4	87	12	1
5	89	11	0
6	89	11	0
7	89	11	0
8	90	10	0
9	90	10	0
10	90	10	0
11	91	9	0
12	91	9	0
13	91	9	0
14	92	8	0
15	92	8	0
16	93	7	0
17	93	7	0
18	94	6	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	96	4	0
25	97	3	0
26	97	3	0
27	98	2	0
28	98	2	0
29	98	2	0
30	98	2	0
31	98	2	0

	Avg high (°C)	Avg low (°C)
1	19	8
2	19	8
3	19	8
4	19	8
5	19	8
6	18	8
7	18	8
8	18	8
9	18	8
10	18	8
11	18	7
12	18	7
13	18	7
14	18	7
15	18	7
16	18	7
17	18	7
18	18	7
19	18	7
20	17	7
21	17	7
22	17	7
23	17	7
24	17	7
25	17	7
26	17	6
27	17	6
28	17	6
29	17	6
30	17	6
31	17	6

	Clearer (%)	Cloudier (%)
1	62	38
2	60	40
3	60	40
4	59	41
5	59	41
6	58	42
7	58	42
8	58	42
9	58	42
10	58	42
11	58	42
12	58	42
13	58	42
14	59	41
15	59	41
16	58	42
17	59	41
18	59	41
19	58	42
20	59	41
21	59	41
22	58	42
23	58	42
24	57	43
25	57	43
26	57	43
27	57	43
28	56	44
29	57	43
30	56	44
31	56	44

	Rain chance (%)
1	22
2	22
3	22
4	22
5	21
6	21
7	22
8	22
9	22
10	22
11	22
12	23
13	23
14	23
15	24
16	24
17	24
18	24
19	24
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	26
31	26

	Dry (%)	Comfortable (%)	Humid (%)
1	86	13	1
2	87	12	1
3	87	12	1
4	87	12	1
5	89	11	0
6	89	11	0
7	89	11	0
8	90	10	0
9	90	10	0
10	90	10	0
11	91	9	0
12	91	9	0
13	91	9	0
14	92	8	0
15	92	8	0
16	93	7	0
17	93	7	0
18	94	6	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	96	4	0
25	97	3	0
26	97	3	0
27	98	2	0
28	98	2	0
29	98	2	0
30	98	2	0
31	98	2	0

	Avg high (°C)	Avg low (°C)
1	19	8
2	19	8
3	19	8
4	19	8
5	19	8
6	18	8
7	18	8
8	18	8
9	18	8
10	18	8
11	18	7
12	18	7
13	18	7
14	18	7
15	18	7
16	18	7
17	18	7
18	18	7
19	18	7
20	17	7
21	17	7
22	17	7
23	17	7
24	17	7
25	17	7
26	17	6
27	17	6
28	17	6
29	17	6
30	17	6
31	17	6

	Clearer (%)	Cloudier (%)
1	62	38
2	60	40
3	60	40
4	59	41
5	59	41
6	58	42
7	58	42
8	58	42
9	58	42
10	58	42
11	58	42
12	58	42
13	58	42
14	59	41
15	59	41
16	58	42
17	59	41
18	59	41
19	58	42
20	59	41
21	59	41
22	58	42
23	58	42
24	57	43
25	57	43
26	57	43
27	57	43
28	56	44
29	57	43
30	56	44
31	56	44

	Rain chance (%)
1	22
2	22
3	22
4	22
5	21
6	21
7	22
8	22
9	22
10	22
11	22
12	23
13	23
14	23
15	24
16	24
17	24
18	24
19	24
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	26
31	26

	Dry (%)	Comfortable (%)	Humid (%)
1	86	13	1
2	87	12	1
3	87	12	1
4	87	12	1
5	89	11	0
6	89	11	0
7	89	11	0
8	90	10	0
9	90	10	0
10	90	10	0
11	91	9	0
12	91	9	0
13	91	9	0
14	92	8	0
15	92	8	0
16	93	7	0
17	93	7	0
18	94	6	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	96	4	0
25	97	3	0
26	97	3	0
27	98	2	0
28	98	2	0
29	98	2	0
30	98	2	0
31	98	2	0