San Marcos weather in January

In January, San Marcos sees average daytime highs of 33°C and overnight lows near 24°C, with 31 mm of rain across 7.8 wet days and about 11.6 hours of daylight. It is the 3rd-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 32°C in the first days to 34°C by the end. The sky is clear or mostly clear about 45% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 11 h 30 min at the start of January to 11 h 36 min by month's end. Set against the rest of the year, January is San Marcos's 1st-clearest and 3rd-windiest month. For the whole year in context, see San Marcos's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
24°
6th coldest
Rainfall
31 mm
7.8 wet days
Daylight
11 h 30 min
6:23 AM – 5:56 PM
Cloud cover
47%
1st clearest
Wind
6 km/h
3rd windiest
Solar energy
5.26 kWh/m²
Travel score
3.8
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 32°C in the first days to 34°C by the end.

A typical January day in San Marcos reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 35°C. Set against its neighbours, January runs about 1°C warmer than December and about 2°C cooler than February.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123324
133324
143324
153324
163324
173324
183324
193324
203325
213325
223325
233325
243325
253425
263425
273425
283425
293425
303425
313425

How January really feels in San Marcos

Once humidity and wind are folded in, January averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
7 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Marcos weather by month

How January compares with the rest of the year at a glance. January is the 3rd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 24°317.811.63.8
Feb35° / 25°316.911.72.9
Mar35° / 26°8015.211.92.3
Apr33° / 25°19825.712.22.1
May32° / 25°31029.312.42.1
Jun32° / 25°26027.112.52.2
Jul32° / 25°24427.312.52.3
Aug32° / 24°25828.312.32.2
Sep32° / 24°26528.912.12.2
Oct31° / 24°27329.811.82.3
Nov31° / 24°19627.211.62.5
Dec32° / 24°9618.811.53.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in January, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of January, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
36040
46238
56238
66337
76436
86436
96436
106535
116634
126634
136634
146634
156634
166733
176733
186832
196832
206832
216832
226931
236931
246931
256931
266931
276931
286931
296931
306832
316832

Chance of precipitation in January

Any precipitation

San Marcos gets around 31 mm of rain over 7.8 wet days in January, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 26% and peaks near 37% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
236
336
435
534
634
733
832
932
1031
1131
1230
1329
1428
1527
1626
1725
1824
1923
2022
2121
2220
2319
2419
2518
2618
2718
2818
2918
3018
3118

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
104159
214257
314455
414554
514653
614752
714851
824949
925048
1025246
1125444
1225543
1325741
1425939
1526038
1626236
1726434
1826533
1926731
2026830
2127028
2227226
2327325
2427424
2527523
2637522
2737621
2837720
2937819
3047818
3147917

Wind in January

Winds average 6 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 7 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
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 30 min at the start of January to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over January. Sunrise moves from 6:19 AM to 6:25 AM, and sunset from 5:49 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:195:49
211.56:195:49
311.56:195:50
411.56:205:50
511.56:205:51
611.56:205:51
711.56:215:52
811.56:215:52
911.56:215:53
1011.56:225:53
1111.56:225:54
1211.56:225:54
1311.56:235:55
1411.56:235:55
1511.56:235:56
1611.56:235:56
1711.66:245:57
1811.66:245:57
1911.66:245:58
2011.66:245:58
2111.66:245:58
2211.66:255:59
2311.66:255:59
2411.66:256:00
2511.66:256:00
2611.66:256:01
2711.66:256:01
2811.66:256:01
2911.66:256:02
3011.66:256:02
3111.66:256:02

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.26 kWh/m².

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 5.7 kWh/m² in March across the year — January's 5.26 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in January

Is January a good time to visit San Marcos?

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

3.8
Sightseeing
1st-best month of the year
6.6
Beach & pool
1st-best month of the year

January is a weaker month for outdoor sightseeing in San Marcos. The water and warmth also suit a beach or pool day.

What to pack for San Marcos in January

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

In January, San Marcos sees daytime highs around 33°C and nights near 24°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in San Marcos in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 11 (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 June 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highJun 15UV 13Dec 13UV 10
UV index (midday)Level
Jan11Extreme
Feb12Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec10Very high

Air quality in San Marcos in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in San Marcos is worst in March — around 34 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1933 µg/m³Nov 1812 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb21Moderate
Mar34Moderate
Apr27Moderate
May22Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep14Moderate
Oct13Moderate
Nov12Moderate
Dec13Moderate
Location & terrain

Where is San Marcos?

San Marcos sits at 8.7°N, 75.1°W, 25 m above sea level, in Colombia. The nearest listed city is San Benito Abad, 32 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 only modest variations in elevation — a maximum elevation change of 18 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, large variations in elevation — a maximum elevation change of 1,004 m.

The land around San Marcos is covered by grassland (57%) within 3 km, grassland (69%) within 16 km, and grassland (68%) within 80 km.

3 km
18 m
16 km
73 m
80 km
1,004 m
treesgrasslandcroplandartificial surfaceswaterwetland
January weather nearby: San Benito Abad 32 km · Ayapel 38 km · Sahagún 47 km · Sucre 48 km · Galeras 56 km · Planeta Rica 57 km · Chinú 58 km · Ciénaga de Oro 59 km

Colombia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 / 240 V · 60 Hz
Prices
≈ 38% of US
price level, 2025
GDP per capita
$8,562
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
74%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
15.4
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 480
Religion
Roman Catholic 64%Protestant 17%none 14%atheist 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 San Marcos (8.6597°, -75.1281°, elevation 25 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).