San Marcos weather in December

In December, San Marcos sees average daytime highs of 19°C and overnight lows near 10°C, with 34 mm of rain across 8.6 wet days and about 11.1 hours of daylight. It is the 12th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of December to 11 h 06 min by month's end. Set against the rest of the year, December is San Marcos's 3rd-clearest and 2nd-windiest month. For the whole year in context, see San Marcos's year-round climate.

Daytime high: 19°; 12th warmest
Overnight low: 10°; 3rd coldest
Rainfall: 34 mm; 8.6 wet days
Daylight: 11 h 06 min; 6:30 AM – 5:37 PM
Cloud cover: 43%; 3rd clearest
Wind: 5 km/h; 2nd windiest
Solar energy: 4.93 kWh/m²
Travel score: 6.6; out of 10

← November San Marcos 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

Day-to-day highs hold fairly steady near 19°C through the month.

A typical December day in San Marcos reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 21°C. Set against its neighbours, December runs on par with 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	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19
Avg low (°C)	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10

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

San Marcos weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	20° / 10°	24	7.4	11.2	6.9
Feb	21° / 10°	25	7.9	11.5	7.0
Mar	21° / 11°	64	16.7	11.9	5.8
Apr	21° / 12°	124	23.8	12.3	4.5
May	21° / 13°	323	29.7	12.7	3.5
Jun	20° / 13°	416	29.2	12.9	3.3
Jul	20° / 12°	268	28.3	12.8	3.6
Aug	20° / 12°	325	29.7	12.5	3.4
Sep	20° / 13°	415	29.7	12.1	3.2
Oct	20° / 12°	293	28.8	11.7	3.5
Nov	20° / 11°	85	18	11.3	5.1
Dec	19° / 10°	34	8.6	11.1	6.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 32% of December, with mostly cloudy or overcast conditions the remaining 23%. Skies tend to open up as the month goes on.

	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 (%)	70	71	73	74	74	76	76	76	76	77	77	77	77	76	76	76	77	77	77	78	78	78	79	79	79	79	79	80	81	81	81
Cloudier (%)	30	29	27	26	26	24	24	24	24	23	23	23	23	24	24	24	23	23	23	22	22	22	21	21	21	21	21	20	19	19	19

	Clearer (%)	Cloudier (%)
1	70	30
2	71	29
3	73	27
4	74	26
5	74	26
6	76	24
7	76	24
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	76	24
15	76	24
16	76	24
17	77	23
18	77	23
19	77	23
20	78	22
21	78	22
22	78	22
23	79	21
24	79	21
25	79	21
26	79	21
27	79	21
28	80	20
29	81	19
30	81	19
31	81	19

Chance of precipitation in December

Any precipitation

San Marcos gets around 34 mm of rain over 8.6 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 29% and peaks near 37% on the wettest days. The odds ease toward the end of the month.

	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 (%)	37	36	34	33	32	31	31	31	31	31	31	31	31	31	31	31	30	30	29	28	28	27	26	25	24	24	23	23	22	22	22

	Rain chance (%)
1	37
2	36
3	34
4	33
5	32
6	31
7	31
8	31
9	31
10	31
11	31
12	31
13	31
14	31
15	31
16	31
17	30
18	30
19	29
20	28
21	28
22	27
23	26
24	25
25	24
26	24
27	23
28	23
29	22
30	22
31	22

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 96% 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 (%)	90	90	91	92	92	93	93	94	94	95	95	95	95	96	96	96	96	97	97	97	98	98	98	99	99	99	99	99	99	99	99
Comfortable (%)	10	10	9	8	8	7	7	6	6	5	5	5	5	4	4	4	4	3	3	3	2	2	2	1	1	1	1	1	1	1	1

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	91	9
4	92	8
5	92	8
6	93	7
7	93	7
8	94	6
9	94	6
10	95	5
11	95	5
12	95	5
13	95	5
14	96	4
15	96	4
16	96	4
17	96	4
18	97	3
19	97	3
20	97	3
21	98	2
22	98	2
23	98	2
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

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 11 h 12 min at the start of December to 11 h 06 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 6:22 AM to 6:37 AM, and sunset from 5:32 PM to 5:44 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)	11.2	11.2	11.2	11.2	11.2	11.2	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1
Sunrise (AM)	6:22	6:22	6:23	6:23	6:24	6:24	6:25	6:26	6:26	6:27	6:27	6:28	6:28	6:29	6:29	6:30	6:30	6:31	6:31	6:32	6:32	6:33	6:33	6:34	6:34	6:35	6:35	6:35	6:36	6:36	6:37
Sunset (PM)	5:32	5:32	5:33	5:33	5:33	5:33	5:34	5:34	5:34	5:35	5:35	5:35	5:36	5:36	5:36	5:37	5:37	5:38	5:38	5:39	5:39	5:40	5:40	5:40	5:41	5:41	5:42	5:43	5:43	5:44	5:44

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.2	6:22	5:32
2	11.2	6:22	5:32
3	11.2	6:23	5:33
4	11.2	6:23	5:33
5	11.2	6:24	5:33
6	11.2	6:24	5:33
7	11.1	6:25	5:34
8	11.1	6:26	5:34
9	11.1	6:26	5:34
10	11.1	6:27	5:35
11	11.1	6:27	5:35
12	11.1	6:28	5:35
13	11.1	6:28	5:36
14	11.1	6:29	5:36
15	11.1	6:29	5:36
16	11.1	6:30	5:37
17	11.1	6:30	5:37
18	11.1	6:31	5:38
19	11.1	6:31	5:38
20	11.1	6:32	5:39
21	11.1	6:32	5:39
22	11.1	6:33	5:40
23	11.1	6:33	5:40
24	11.1	6:34	5:40
25	11.1	6:34	5:41
26	11.1	6:35	5:41
27	11.1	6:35	5:42
28	11.1	6:35	5:43
29	11.1	6:36	5:43
30	11.1	6:36	5:44
31	11.1	6:37	5:44

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.93 kWh/m².

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 6.24 kWh/m² in April across the year — December's 4.93 kWh/m² falls in the middle.

	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)	4.8	4.8	4.8	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.8	Bright
2	4.8	Bright
3	4.8	Bright
4	4.9	Bright
5	4.9	Bright
6	4.9	Bright
7	4.9	Bright
8	4.9	Bright
9	4.9	Bright
10	4.9	Bright
11	4.9	Bright
12	4.9	Bright
13	4.9	Bright
14	4.9	Bright
15	4.9	Bright
16	4.9	Bright
17	4.9	Bright
18	4.9	Bright
19	4.9	Bright
20	4.9	Bright
21	4.9	Bright
22	4.9	Bright
23	4.9	Bright
24	5.0	Bright
25	5.0	Bright
26	5.0	Bright
27	5.0	Bright
28	5.0	Bright
29	5.0	Bright
30	5.0	Bright
31	5.0	Bright

Planning a trip in December

Hazard calendar for San Marcos

In seasonPeak

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

San Marcos's rainy season runs May–October, 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 San Marcos?

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

6.6

Sightseeing

3rd-best month of the year

3.1

Beach & pool

4th-best month of the year

December is a reasonable time to visit San Marcos for sightseeing.

What to pack for San Marcos in December

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

In December, San Marcos sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 9 days see rain.

rain gearsun protection

UV index in San Marcos in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Marcos peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 9 (very high).

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)	9	13	14	14	12	13	13	13	12	11	9	9
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	13	Extreme
Mar	14	Extreme
Apr	14	Extreme
May	12	Extreme
Jun	13	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	9	Very high
Dec	9	Very high

Air quality in San Marcos 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 San Marcos is worst in May — around 34 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	22	25	34	34	23	23	22	23	23	23	25
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	22	Moderate
Mar	25	Moderate
Apr	34	Moderate
May	34	Moderate
Jun	23	Moderate
Jul	23	Moderate
Aug	22	Moderate
Sep	23	Moderate
Oct	23	Moderate
Nov	23	Moderate
Dec	25	Moderate

Location & terrain

Where is San Marcos?

San Marcos sits at 15.0°N, 91.8°W, 2,380 m above sea level, in Guatemala. The nearest listed city is San Pedro Sacatepéquez, 4.0 km away.

Topography around San Marcos

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

Within 3 km, the terrain around San Marcos has large variations in elevation — a maximum elevation change of 814 m around an average of 2,422 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,414 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.

The land around San Marcos is covered by trees (47%), artificial surfaces (30%) and cropland (22%) within 3 km, trees (80%) within 16 km, and trees (69%) within 80 km.

3 km

814 m

trees 47%

16 km

3,414 m

trees 80%

80 km

4,178 m

trees 69%

treesshrubsgrasslandcroplandartificial surfaceswatermangroves

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

December weather nearby: San Pedro Sacatepéquez 4.0 km · Comitancillo 15 km · Cabricán 20 km · Ostuncalco 21 km · La Esperanza 27 km · Malacatán 29 km · Colomba 29 km · Coatepeque 30 km

Guatemala travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 43% of US; price level, 2025
GDP per capita: $6,598; 2025
Happiness: 6.5 / 10; World Happiness, 2025
Safe drinking water: 49%; of population, 2024
Homicide rate: 23.4; per 100k, 2023
Road deaths: 22.9; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Moderate; EF EPI 510
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 San Marcos (14.9644°, -91.7949°, elevation 2,380 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	11
2	19	11
3	19	11
4	19	11
5	19	10
6	19	10
7	19	10
8	19	10
9	19	10
10	19	10
11	19	10
12	19	10
13	19	10
14	19	10
15	19	10
16	19	10
17	19	10
18	19	10
19	19	10
20	19	10
21	19	10
22	19	10
23	19	10
24	19	10
25	19	10
26	19	10
27	19	10
28	19	10
29	19	10
30	19	10
31	19	10

	Clearer (%)	Cloudier (%)
1	70	30
2	71	29
3	73	27
4	74	26
5	74	26
6	76	24
7	76	24
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	76	24
15	76	24
16	76	24
17	77	23
18	77	23
19	77	23
20	78	22
21	78	22
22	78	22
23	79	21
24	79	21
25	79	21
26	79	21
27	79	21
28	80	20
29	81	19
30	81	19
31	81	19

	Rain chance (%)
1	37
2	36
3	34
4	33
5	32
6	31
7	31
8	31
9	31
10	31
11	31
12	31
13	31
14	31
15	31
16	31
17	30
18	30
19	29
20	28
21	28
22	27
23	26
24	25
25	24
26	24
27	23
28	23
29	22
30	22
31	22

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	91	9
4	92	8
5	92	8
6	93	7
7	93	7
8	94	6
9	94	6
10	95	5
11	95	5
12	95	5
13	95	5
14	96	4
15	96	4
16	96	4
17	96	4
18	97	3
19	97	3
20	97	3
21	98	2
22	98	2
23	98	2
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

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

	Clearer (%)	Cloudier (%)
1	70	30
2	71	29
3	73	27
4	74	26
5	74	26
6	76	24
7	76	24
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	76	24
15	76	24
16	76	24
17	77	23
18	77	23
19	77	23
20	78	22
21	78	22
22	78	22
23	79	21
24	79	21
25	79	21
26	79	21
27	79	21
28	80	20
29	81	19
30	81	19
31	81	19

	Rain chance (%)
1	37
2	36
3	34
4	33
5	32
6	31
7	31
8	31
9	31
10	31
11	31
12	31
13	31
14	31
15	31
16	31
17	30
18	30
19	29
20	28
21	28
22	27
23	26
24	25
25	24
26	24
27	23
28	23
29	22
30	22
31	22

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	91	9
4	92	8
5	92	8
6	93	7
7	93	7
8	94	6
9	94	6
10	95	5
11	95	5
12	95	5
13	95	5
14	96	4
15	96	4
16	96	4
17	96	4
18	97	3
19	97	3
20	97	3
21	98	2
22	98	2
23	98	2
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

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

	Clearer (%)	Cloudier (%)
1	70	30
2	71	29
3	73	27
4	74	26
5	74	26
6	76	24
7	76	24
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	76	24
15	76	24
16	76	24
17	77	23
18	77	23
19	77	23
20	78	22
21	78	22
22	78	22
23	79	21
24	79	21
25	79	21
26	79	21
27	79	21
28	80	20
29	81	19
30	81	19
31	81	19

	Rain chance (%)
1	37
2	36
3	34
4	33
5	32
6	31
7	31
8	31
9	31
10	31
11	31
12	31
13	31
14	31
15	31
16	31
17	30
18	30
19	29
20	28
21	28
22	27
23	26
24	25
25	24
26	24
27	23
28	23
29	22
30	22
31	22

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	91	9
4	92	8
5	92	8
6	93	7
7	93	7
8	94	6
9	94	6
10	95	5
11	95	5
12	95	5
13	95	5
14	96	4
15	96	4
16	96	4
17	96	4
18	97	3
19	97	3
20	97	3
21	98	2
22	98	2
23	98	2
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1