San Martín weather in May

In May, San Martín sees average daytime highs of 28°C and overnight lows near 22°C, with 644 mm of rain across 30.7 wet days and about 12.4 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 0% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of May to 12 h 24 min by month's end. Set against the rest of the year, May is San Martín's 12th-clearest and 10th-windiest month. For the whole year in context, see San Martín's year-round climate.

Daytime high
28°
5th warmest
Overnight low
22°
12th coldest
Rainfall
644 mm
30.7 wet days
Daylight
12 h 24 min
5:39 AM – 6:01 PM
Cloud cover
95%
12th clearest
Wind
4 km/h
10th windiest
Solar energy
4.59 kWh/m²
Travel score
3.0
out of 10

San Martín is municipality in Cesar, Colombia.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical May day in San Martín reaches about 28°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, May runs on par with April and on par with June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62822
72822
82822
92822
102822
112822
122822
132822
142822
152822
162822
172822
182822
192822
202822
212822
222822
232822
242822
252822
262822
272822
282822
292822
302822
312822

San Martín weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°11120.211.64.5
Feb29° / 21°14318.711.74.1
Mar29° / 22°27526.611.93.4
Apr28° / 22°47829.612.22.9
May28° / 22°64430.712.43.0
Jun28° / 21°61729.812.53.1
Jul28° / 21°59130.812.43.2
Aug28° / 21°5883112.33.1
Sep28° / 21°50629.8123.2
Oct28° / 21°45230.111.83.3
Nov28° / 21°3782911.63.3
Dec28° / 21°20626.211.53.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 2% of May, with mostly cloudy or overcast conditions the remaining 98%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1397
2397
3397
4397
5397
6298
7298
8298
9298
10298
11298
12298
13298
14298
15298
16298
17298
18298
19298
20298
21298
22298
23298
24298
25298
26298
27298
28298
29298
30397
31397

Chance of precipitation in May

Any precipitation

San Martín gets around 644 mm of rain over 30.7 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 99% and peaks near 99% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
199
299
399
499
599
699
799
899
999
1099
1199
1299
1399
1499
1599
1699
1799
1899
1999
2099
2199
2299
2399
2499
2599
2699
2799
2899
2999
3099
3199

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 96% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)
1496
2496
3496
4496
5397
6397
7397
8397
9397
10298
11298
12298
13298
14298
15298
16298
17397
18397
19397
20496
21496
22496
23595
24595
25595
26694
27694
28694
29793
30793
31793

Wind in May

Winds average 4 km/h in May.

Across May, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 18 min at the start of May to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over May. Sunrise moves from 5:43 AM to 5:39 AM, and sunset from 6:00 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:436:00
212.35:436:00
312.35:426:00
412.35:426:00
512.35:426:00
612.35:416:00
712.35:416:00
812.35:416:00
912.35:416:00
1012.35:406:00
1112.35:406:00
1212.35:406:01
1312.35:406:01
1412.45:406:01
1512.45:406:01
1612.45:396:01
1712.45:396:01
1812.45:396:02
1912.45:396:02
2012.45:396:02
2112.45:396:02
2212.45:396:02
2312.45:396:02
2412.45:396:03
2512.45:396:03
2612.45:396:03
2712.45:396:03
2812.45:396:04
2912.45:396:04
3012.45:396:04
3112.45:396:04

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.59 kWh/m².

For context, solar energy here swings from a low near 4.3 kWh/m² to a high of 5.68 kWh/m² in February across the year — May's 4.59 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.8Bright
314.8Bright
Planning a trip in May

Is May a good time to visit San Martín?

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

3.0
Sightseeing
11th-best month of the year
3.5
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in San Martín.

What to pack for San Martín in May

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

In May, San Martín sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 31 days see rain.

light clothesrain gearsun protection

UV index in San Martín in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 San Martín peaks around February 16 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 highFeb 16UV 13Dec 13UV 10
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar12Extreme
Apr11Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep13Extreme
Oct12Extreme
Nov10Extreme
Dec10Very high

Air quality in San Martín in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in San Martín is worst in March — around 46 µg/m³ PM2.5 (poor), about 3.7× the cleanest month (December, 13 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1844 µg/m³Dec 1113 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb26Moderate
Mar46Poor
Apr32Moderate
May23Moderate
Jun21Moderate
Jul21Moderate
Aug19Moderate
Sep16Moderate
Oct14Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is San Martín?

San Martín sits at 8.0°N, 73.5°W, 112 m above sea level, in Colombia. The nearest listed city is Ocaña, 31 km away.

Topography around San Martín

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

Within 3 km, the terrain around San Martín has only modest variations in elevation — a maximum elevation change of 53 m around an average of 105 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,315 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,956 m.

The land around San Martín is covered by grassland (63%) and trees (32%) within 3 km, grassland (58%) and trees (41%) within 16 km, and trees (58%) and grassland (40%) within 80 km.

3 km
53 m
16 km
1,315 m
80 km
3,956 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Ocaña 31 km · Aguachica 36 km · Simití 48 km · Morales 50 km · Sabana de Torres 68 km · Puerto Wilches 84 km · El Zulia 101 km · Tiquisio 103 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 Martín (8.0018°, -73.5114°, elevation 112 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).