Harlingen weather in August

In August, Harlingen sees average daytime highs of 95°F and overnight lows near 78°F, with 2.1 in of rain across 9.4 wet days and about 12.9 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 95°F through the month. The sky is clear or mostly clear about 47% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 12 min at the start of August to 12 h 36 min by month's end. Set against the rest of the year, August is Harlingen's 4th-clearest and 9th-windiest month. For the whole year in context, see Harlingen's year-round climate.

Daytime high
95°
1st warmest
Overnight low
78°
12th coldest
Rainfall
2.1 in
9.4 wet days
Daylight
12 h 54 min
6:07 AM – 7:03 PM
Cloud cover
48%
4th clearest
Wind
10 mph
9th windiest
Solar energy
6.34 kWh/m²
Travel score
2.5
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 August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 95°F through the month.

A typical August day in Harlingen reaches about 95°F in the afternoon and slips back to 78°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 90°F and 100°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
19678
29678
39678
49678
59678
69678
79678
89678
99678
109678
119678
129678
139678
149678
159678
169678
179678
189678
199578
209578
219578
229578
239578
249578
259578
269477
279477
289477
299477
309477
319477

How August really feels in Harlingen

Once humidity and wind are folded in, August averages 31 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
31
31 feel dangerously hot (≥ 102°F)
Days feeling ≤ 32°F
0
wind chill below the day's low

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

Harlingen weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27129
37129
47129
57129
67129
77030
87030
97030
106931
116832
126832
136832
146733
156733
166634
176634
186733
196634
206634
216634
226634
236535
246436
256337
266238
276139
286040
295941
305842
315743

Chance of precipitation in August

Any precipitation

Harlingen gets around 2.1 in of rain over 9.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 31% and peaks near 47% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
124
224
324
424
524
624
724
824
925
1025
1125
1226
1326
1427
1527
1628
1729
1830
1931
2032
2133
2234
2335
2436
2538
2639
2741
2843
2944
3046
3147

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 69% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
107525
207426
307426
407327
517227
617128
717128
817029
917029
1017029
1116930
1216930
1316930
1426830
1526830
1626830
1726830
1826929
1926929
2026929
2126929
2236829
2336829
2436829
2536829
2646630
2746630
2846531
2956332
3056332
3166133

Wind in August

Winds average 10 mph in August.

Across August, daily wind ranges from about 8 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
308light breeze
318light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 12 min at the start of August to 12 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over August. Sunrise moves from 6:00 AM to 6:14 AM, and sunset from 7:14 PM to 6:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:007:14
213.26:007:13
313.26:017:13
413.26:017:12
513.26:027:12
613.16:027:11
713.16:037:10
813.16:037:09
913.16:047:09
1013.16:047:08
1113.06:057:07
1213.06:057:06
1313.06:067:05
1413.06:067:05
1513.06:077:04
1612.96:077:03
1712.96:077:02
1812.96:087:01
1912.96:087:00
2012.86:096:59
2112.86:096:58
2212.86:106:57
2312.86:106:56
2412.76:116:55
2512.76:116:54
2612.76:126:53
2712.76:126:52
2812.66:136:51
2912.66:136:50
3012.66:136:49
3112.66:146:48

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.34 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 — August's 6.34 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.6Intense
76.6Intense
86.6Intense
96.6Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.4Intense
156.4Intense
166.4Intense
176.3Intense
186.3Intense
196.3Intense
206.2Intense
216.2Intense
226.1Intense
236.1Intense
246.0Intense
256.0Intense
266.0Bright
275.9Bright
285.8Bright
295.8Bright
305.8Bright
315.7Bright
Planning a trip in August

Hazard calendar for Harlingen

In seasonPeak

In August, Harlingen sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

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 August a good time to visit Harlingen?

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

2.5
Sightseeing
12th-best month of the year
5.4
Beach & pool
11th-best month of the year

August is a weaker month for outdoor sightseeing in Harlingen.

What to pack for Harlingen in August

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

In August, Harlingen sees daytime highs around 95°F and nights near 78°F. Pack light clothes and sun protection. Worth having: rain gear. About 9 days see rain.

light clothessun protectionrain gear

Sea temperature near Harlingen in August

The nearest coast averages about 83°F in August — 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 August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 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 August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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
August 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).