La Unión weather in March

In March, La Unión sees average daytime highs of 23°C and overnight lows near 15°C, with 401 mm of rain across 29.6 wet days and about 12 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 0% of the time in March, and the air most often feels humid.

Daylight stretches from about 12 hours at the start of March to 12 hours by month's end. Set against the rest of the year, March is La Unión's 10th-clearest and 10th-windiest month. For the whole year in context, see La Unión's year-round climate.

Daytime high
23°
8th warmest
Overnight low
15°
10th coldest
Rainfall
401 mm
29.6 wet days
Daylight
12 hours
6:19 AM – 6:18 PM
Cloud cover
89%
10th clearest
Wind
3 km/h
10th windiest
Solar energy
5.08 kWh/m²
Travel score
3.6
out of 10

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 23°C through the month.

A typical March day in La Unión reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 24°C. Set against its neighbours, March runs on par with February and on par with April.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92315
102315
112315
122315
132315
142315
152315
162315
172315
182315
192315
202315
212315
222315
232315
242315
252315
262315
272315
282315
292315
302315
312315

La Unión weather by month

How March compares with the rest of the year at a glance. March is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 15°34229.211.93.7
Feb23° / 15°34326.311.93.6
Mar23° / 15°40129.6123.6
Apr23° / 15°44129.3123.5
May23° / 15°39229.112.13.6
Jun23° / 15°27024.312.14.3
Jul24° / 15°18120.112.15.2
Aug24° / 15°14718.412.15.4
Sep24° / 15°25824.5124.3
Oct23° / 15°38129.6123.6
Nov22° / 15°39328.911.93.4
Dec22° / 15°38829.611.93.6

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 3% of March, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1397
2397
3397
4397
5397
6397
7496
8496
9496
10496
11496
12496
13496
14496
15496
16397
17397
18397
19397
20397
21397
22298
23298
24298
25298
26298
27298
28298
29298
30298
31298

Chance of precipitation in March

Any precipitation

La Unión gets around 401 mm of rain over 29.6 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 95% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
195
295
395
495
595
695
795
895
995
1095
1195
1295
1395
1495
1595
1695
1795
1895
1995
2095
2196
2296
2396
2496
2596
2696
2796
2896
2996
3096
3196

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the humid band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
114950
214950
314950
414950
514950
614950
714950
814950
914950
1014950
1114950
1214950
1314950
1414851
1514851
1614851
1714851
1814752
1914752
2014752
2114752
2214752
2314752
2414752
2514851
2614851
2714851
2814851
2904852
3004852
3104852

Wind in March

Winds average 3 km/h in March.

Across March, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

Sunrise & sunset in March

DaylightNight

Daylight runs from about 12 hours at the start of March to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over March. Sunrise moves from 6:23 AM to 6:13 AM, and sunset from 6:21 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:236:21
212.06:236:21
312.06:226:20
412.06:226:20
512.06:226:20
612.06:226:20
712.06:216:20
812.06:216:20
912.06:216:19
1012.06:206:19
1112.06:206:19
1212.06:206:19
1312.06:196:19
1412.06:196:18
1512.06:196:18
1612.06:196:18
1712.06:186:18
1812.06:186:17
1912.06:176:17
2012.06:176:17
2112.06:176:17
2212.06:166:16
2312.06:166:16
2412.06:166:16
2512.06:156:16
2612.06:156:15
2712.06:156:15
2812.06:146:15
2912.06:146:14
3012.06:146:14
3112.06:136:14

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 5.08 kWh/m².

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 5.59 kWh/m² in September across the year — March's 5.08 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in March

Is March a good time to visit La Unión?

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

3.6
Sightseeing
6th-best month of the year
2.7
Beach & pool
9th-best month of the year

March is a weaker month for outdoor sightseeing in La Unión.

What to pack for La Unión in March

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

In March, La Unión sees daytime highs around 23°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 30 days see rain.

rain gearlight clothessun protection

UV index in La Unión in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 16 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in La Unión peaks around February 19 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 12 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 16Jul 24UV 12
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr14Extreme
May15Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Air quality in La Unión in March

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in La Unión is worst in March — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (July, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1218 µg/m³Jul 1111 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb18Moderate
Mar18Moderate
Apr16Moderate
May13Moderate
Jun11Good
Jul11Good
Aug14Moderate
Sep17Moderate
Oct15Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is La Unión?

La Unión sits at 1.6°N, 77.1°W, 1,721 m above sea level, in Colombia. The nearest listed city is San Lorenzo, 15 km away.

Topography around La Unión

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

Within 3 km, the terrain around La Unión has large variations in elevation — a maximum elevation change of 1,092 m around an average of 1,673 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,489 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,093 m.

The land around La Unión is covered by trees (94%) within 3 km, trees (64%) and grassland (36%) within 16 km, and trees (76%) and grassland (23%) within 80 km.

3 km
1,092 m
16 km
2,489 m
80 km
4,093 m
treesgrasslandartificial surfaces
March weather nearby: San Lorenzo 15 km · Buesaco 25 km · Providencia 37 km · Pasto 46 km · Balboa 50 km · Patía 52 km · Samaniego 59 km · Mocoa 73 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 La Unión (1.6045°, -77.1315°, elevation 1,721 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).