La Unión weather in March

In March, La Unión sees average daytime highs of 29°C and overnight lows near 27°C, with 8 mm of rain across 2.6 wet days and about 11.9 hours of daylight. It is the 6th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 83% of the time in March, and the air most often feels oppressive.

Daylight stretches from about 11 h 42 min at the start of March to 12 h 06 min by month's end. Set against the rest of the year, March is La Unión's 3rd-clearest and 3rd-windiest month. For the whole year in context, see La Unión's year-round climate.

Daytime high
29°
6th warmest
Overnight low
27°
9th coldest
Rainfall
8 mm
2.6 wet days
Daylight
11 h 54 min
6:04 AM – 5:58 PM
Cloud cover
21%
3rd clearest
Wind
14 km/h
3rd windiest
Solar energy
6.78 kWh/m²
Travel score
7.0
out of 10

La Unión is city in El Salvador.

Density
186/km²
people per km²
Founded
1854

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical March day in La Unión reaches about 29°C in the afternoon and slips back to 27°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, March runs on par with February and on par with April.

25°28°30°33°35°151015202531
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122927
132927
142927
152927
162927
172927
182927
192927
202927
212927
222927
232927
242927
252927
262927
272927
282927
292927
302927
312927

How March really feels in La Unión

Once humidity and wind are folded in, March averages 16 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
16
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

La Unión weather by month

How March compares with the rest of the year at a glance. March is the 6th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 26°10.411.37.4
Feb29° / 26°20.611.67.4
Mar29° / 27°82.611.97.0
Apr29° / 27°409.912.35.6
May29° / 27°27721.412.64.0
Jun30° / 27°31320.912.83.8
Jul30° / 27°14612.412.74.5
Aug30° / 27°25619.212.44.1
Sep29° / 26°37525.112.13.6
Oct28° / 26°34422.111.74.2
Nov29° / 26°486.711.46.2
Dec29° / 26°30.911.27.2

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 83% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 8% of March, with mostly cloudy or overcast conditions the remaining 9%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1946
2946
3937
4937
5937
6937
7937
8937
9937
10928
11928
12928
13928
14928
15928
16928
17928
18919
19919
20919
21919
229010
239010
249010
259010
268911
278911
288911
298911
308812
318812

Chance of precipitation in March

Any precipitation

La Unión gets around 8 mm of rain over 2.6 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 9% and peaks near 16% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
14
24
34
44
55
65
75
85
96
106
116
127
137
147
158
168
179
189
1910
2010
2111
2211
2311
2412
2512
2612
2713
2814
2914
3015
3116

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11533565
21633546
31633546
41633546
51633546
61633537
71532557
81532557
91531567
101531567
111530577
121430587
131429597
141428598
150428608
160327628
170326638
180325639
190324649
200223669
2102236510
2202226610
2302216611
2402206612
2502186713
2602176714
2701166815
2801156816
2901136818
3001126819
3101116721

Wind in March

Winds average 14 km/h in March.

Across March, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in March

DaylightNight

Daylight runs from about 11 h 42 min at the start of March to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over March. Sunrise moves from 6:13 AM to 5:53 AM, and sunset from 5:56 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:135:56
211.76:125:56
311.76:125:57
411.86:115:57
511.86:115:57
611.86:105:57
711.86:105:57
811.86:095:57
911.86:085:57
1011.86:085:58
1111.86:075:58
1211.96:065:58
1311.96:065:58
1411.96:055:58
1511.96:045:58
1611.96:045:58
1711.96:035:58
1811.96:025:58
1911.96:025:59
2012.06:015:59
2112.06:005:59
2212.06:005:59
2312.05:595:59
2412.05:585:59
2512.05:585:59
2612.05:575:59
2712.05:565:59
2812.15:555:59
2912.15:555:59
3012.15:545:59
3112.15:535:59

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 6.78 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.18 kWh/m² to a high of 6.78 kWh/m² in March across the year — March's 6.78 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.6Intense
46.6Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.8Intense
236.8Intense
246.8Intense
256.8Intense
266.8Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in March

Hazard calendar for La Unión

In seasonPeak

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

La Unión sits in the Atlantic hurricane belt; the season peaks August–October.

La Unión's monsoon runs August–October, when most of the year's rain falls.

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

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).

7.0
Sightseeing
4th-best month of the year
8.9
Beach & pool
4th-best month of the year

March is one of the better times to visit La Unión for general sightseeing. The water and warmth also suit a beach or pool day.

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 29°C and nights near 27°C. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near La Unión in March

The nearest coast averages about 28°C in March — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in August at about 30°C and coldest in January near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Warm
Mar28Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in La Unión in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 13 (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 March 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 20UV 13Dec 14UV 9
UV index (midday)Level
Jan10Extreme
Feb12Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

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 April — around 34 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (January, 10 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 2233 µg/m³Jan 1010 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar20Moderate
Apr34Moderate
May32Moderate
Jun21Moderate
Jul24Moderate
Aug20Moderate
Sep18Moderate
Oct17Moderate
Nov14Moderate
Dec10Good
Location & terrain

Where is La Unión?

La Unión sits at 13.3°N, 87.8°W, 10 m above sea level, in El Salvador. The nearest listed city is Langue, 37 km away.

LangueSan MiguelSan Francisco GoteraSan Rafael OrienteUsulutánSantiago de María

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 only modest variations in elevation — a maximum elevation change of 245 m around an average of 38 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,230 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,074 m.

The land around La Unión is covered by water (43%) and trees (33%) within 3 km, trees (39%) and water (32%) within 16 km, and trees (42%) and water (32%) within 80 km.

3 km
245 m
16 km
1,230 m
80 km
2,074 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
March weather nearby: Langue 37 km · San Miguel 40 km · San Lorenzo 44 km · San Francisco Gotera 49 km · San Rafael Oriente 55 km · Marcovia 58 km · Usulután 65 km · Santiago de María 69 km

El Salvador travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
115 V · 60 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$5,767
2025
Happiness
6.6 / 10
World Happiness, 2025
Homicide rate
7.9
per 100k, 2022
Road deaths
20.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 523
Religion
Roman Catholic 44%Protestant 40%none 16%

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 (13.3392°, -87.8433°, elevation 10 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).