Harlingen weather in March

In March, Harlingen sees average daytime highs of 80°F and overnight lows near 62°F, with 1.6 in of rain across 5.5 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 78°F in the first days to 82°F by the end. The sky is clear or mostly clear about 36% of the time in March, and the air most often feels muggy.

Daylight stretches from about 11 h 24 min at the start of March to 12 h 12 min by month's end. Set against the rest of the year, March is Harlingen's 9th-clearest and 3rd-windiest month. For the whole year in context, see Harlingen's year-round climate.

Daytime high
80°
8th warmest
Overnight low
62°
5th coldest
Rainfall
1.6 in
5.5 wet days
Daylight
11 h 48 min
6:46 AM – 6:35 PM
Cloud cover
55%
9th clearest
Wind
11 mph
3rd windiest
Solar energy
4.69 kWh/m²
Travel score
7.2
out of 10

Harlingen is city in Cameron County, Texas, United States.

Density
630/km²
people per km²
Founded
1904

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 78°F in the first days to 82°F by the end.

A typical March day in Harlingen reaches about 80°F in the afternoon and slips back to 62°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 89°F. Set against its neighbours, March runs about 5°F warmer than February and about 5°F cooler than April.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17859
27859
37859
47860
57860
67860
77860
87860
97960
107961
117961
127961
137962
148062
158062
168062
178062
188063
198063
208163
218163
228164
238164
248264
258264
268264
278265
288265
298265
308365
318365

How March really feels in Harlingen

Once humidity and wind are folded in, March averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

March sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Harlingen weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan71° / 53°1.25.110.57.3
Feb75° / 57°1.04.911.17.6
Mar80° / 62°1.65.511.87.2
Apr85° / 68°1.75.512.65.7
May90° / 73°1.96.513.34.3
Jun94° / 77°2.38.913.63.1
Jul95° / 78°2.48.513.52.6
Aug95° / 78°2.19.412.92.5
Sep91° / 75°4.114.412.23.4
Oct86° / 68°2.77.911.45.5
Nov78° / 61°1.56.510.77.4
Dec73° / 55°1.35.510.47.4

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45050
55050
64951
74951
84951
94951
104951
115050
125050
135149
145248
155248
165347
175446
185446
195446
205446
215347
225446
235347
245347
255248
265248
275149
285050
295050
305050
315050

Chance of precipitation in March

Any precipitation

Harlingen gets around 1.6 in of rain over 5.5 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 18% and peaks near 21% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
117
217
318
418
519
619
720
820
921
1021
1121
1221
1321
1421
1520
1620
1719
1819
1918
2017
2117
2216
2316
2416
2515
2615
2716
2816
2917
3017
3118

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the muggy band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1401315301
2401315301
3401315301
4401315302
5401415302
6391415302
7381416302
8371416302
9361517303
10351518303
11331518313
12321519313
13311519313
14301520324
15291520324
16281521334
17271421344
18261422344
19251322355
20241322365
21231222376
22221222386
23221122387
24211122388
25211122389
26211021389
272010213910
282010203911
292010203812
30199203813
31199193815

Wind in March

Winds average 11 mph in March.

Across March, daily wind ranges from about 11 mph on the calmest days to 12 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
611light breeze
711light breeze
811light breeze
911light breeze
1011light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2511light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in March

DaylightNight

Daylight runs from about 11 h 24 min at the start of March to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over March. Sunrise moves from 7:01 AM to 6:30 AM, and sunset from 6:27 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:016:27
211.47:006:27
311.57:006:28
411.56:596:28
511.56:586:29
611.56:576:29
711.66:566:30
811.66:556:31
911.66:546:31
1011.76:536:32
1111.76:516:32
1211.76:506:33
1311.76:496:33
1411.86:486:34
1511.86:476:34
1611.86:466:35
1711.86:456:35
1811.96:446:36
1911.96:436:36
2011.96:426:37
2111.96:416:37
2212.06:406:38
2312.06:396:38
2412.06:376:39
2512.06:366:39
2612.16:356:40
2712.16:346:40
2812.16:336:40
2912.26:326:41
3012.26:316:41
3112.26:306:42

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.69 kWh/m².

For context, solar energy here swings from a low near 2.91 kWh/m² to a high of 6.72 kWh/m² in July across the year — March's 4.69 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.4Bright
84.4Bright
94.4Bright
104.5Bright
114.5Bright
124.5Bright
134.6Bright
144.6Bright
154.6Bright
164.7Bright
174.7Bright
184.8Bright
194.8Bright
204.8Bright
214.9Bright
224.9Bright
234.9Bright
245.0Bright
255.0Bright
265.0Bright
275.1Bright
285.1Bright
295.1Bright
305.2Bright
315.2Bright
Planning a trip in March

Hazard calendar for Harlingen

In seasonPeak

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

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

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

Is March a good time to visit Harlingen?

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

7.2
Sightseeing
5th-best month of the year
7.2
Beach & pool
3rd-best month of the year

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

What to pack for Harlingen in March

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

In March, Harlingen sees daytime highs around 80°F and nights near 62°F. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

Sea temperature near Harlingen in March

The nearest coast averages about 67°F 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 35 mi away) is warmest in September at about 84°F and coldest in February near 65°F.

It's comfortable for a long swim from Mar 22 to Dec 29 — about 9.3 months when the water holds above 68°F.

60°70°80°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan66Cool
Feb65Cool
Mar67Cool
Apr72Refreshing
May77Warm
Jun82Warm
Jul82Tropical
Aug83Tropical
Sep84Tropical
Oct81Warm
Nov75Refreshing
Dec70Refreshing

UV index in Harlingen in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Harlingen peaks around June 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highExtremeVery highHighJun 21UV 12Dec 22UV 5
UV index (midday)Level
Jan5Moderate
Feb7High
Mar8Very high
Apr11Extreme
May9Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Harlingen 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 Harlingen is worst in July — around 25 µg/m³ PM2.5 (moderate), about 3.7× the cleanest month (October, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1525 µg/m³Oct 247 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr13Moderate
May19Moderate
Jun20Moderate
Jul25Moderate
Aug18Moderate
Sep13Moderate
Oct7Good
Nov7Good
Dec9Good
Location & terrain

Where is Harlingen?

Harlingen sits at 26.2°N, 97.7°W, 39 ft above sea level, in United States. The nearest listed city is San Benito, 5.6 mi away.

Topography around Harlingen

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Harlingen.

Within 2 miles, the terrain around Harlingen has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 43 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 82 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 446 ft.

The land around Harlingen is covered by artificial surfaces (56%) and trees (25%) within 2 miles, cropland (52%) and grassland (22%) within 10 miles, and cropland (34%), grassland (22%) and water (20%) within 50 miles.

2 miles
66 ft
10 miles
82 ft
50 miles
446 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
March weather nearby: San Benito 5.6 mi · Mercedes 14 mi · Weslaco 19 mi · Donna 22 mi · Brownsville 24 mi · Heroica Matamoros 25 mi · Alamo 27 mi · Ciudad Río Bravo 28 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Harlingen (26.1906°, -97.6961°, elevation 39 ft), 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).