Harlingen in Summer
In summer (June, July and August), Harlingen sees average daytime highs around 95°F and overnight lows near 78°F, with 6.7 in of rain over about 27 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 95°F. The sky is clear or mostly clear about 51% of the time across summer, and the air most often feels oppressive.
Summer is Harlingen's weakest season of the year to visit on our travel score. For the whole year in context, see Harlingen's year-round climate.
- Avg daytime high
- 95°F
- warmest season of the year
- Avg overnight low
- 78°F
- Rainfall
- 6.7 in
- 27 wet days
- Avg wind
- 11 mph
- Travel score
- 2.7
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Harlingen in Summer
Across summer, daytime highs hold fairly steady around 95°F.
A typical summer day in Harlingen reaches about 95°F and drops to 78°F overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Harlingen
Once humidity and wind are folded in, summer brings about 92 days that feel above 90°F and 0 that feel at or below 32°F.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Harlingen weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 71° / 53° | 1.2 | 5.1 | 10.5 | 7.3 |
| Feb | 75° / 57° | 1.0 | 4.9 | 11.1 | 7.6 |
| Mar | 80° / 62° | 1.6 | 5.5 | 11.8 | 7.2 |
| Apr | 85° / 68° | 1.7 | 5.5 | 12.6 | 5.7 |
| May | 90° / 73° | 1.9 | 6.5 | 13.3 | 4.3 |
| Jun | 94° / 77° | 2.3 | 8.9 | 13.6 | 3.1 |
| Jul | 95° / 78° | 2.4 | 8.5 | 13.5 | 2.6 |
| Aug | 95° / 78° | 2.1 | 9.4 | 12.9 | 2.5 |
| Sep | 91° / 75° | 4.1 | 14.4 | 12.2 | 3.4 |
| Oct | 86° / 68° | 2.7 | 7.9 | 11.4 | 5.5 |
| Nov | 78° / 61° | 1.5 | 6.5 | 10.7 | 7.4 |
| Dec | 73° / 55° | 1.3 | 5.5 | 10.4 | 7.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 51% of the time across summer.
Chance of precipitation in Summer
Harlingen gets around 6.7 in of rain over 27 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 30 min in early June to 12 h 36 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.5 kWh/m².
Hazard calendar for Harlingen
In summer, Harlingen overlaps 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.
Is summer a good time to visit Harlingen?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Harlingen.
What to pack for Harlingen in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Harlingen sees daytime highs around 95°F and nights near 78°F. Pack light clothes and sun protection. Worth having: rain gear. About 27 days see rain.
Sea temperature near Harlingen in Summer
The nearest coast averages about 82°F across summer — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 66 | 65 | 67 | 72 | 77 | 82 | 82 | 83 | 84 | 81 | 75 | 70 |
| Comfort | Cool | Cool | Cool | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 66 | Cool |
| Feb | 65 | Cool |
| Mar | 67 | Cool |
| Apr | 72 | Refreshing |
| May | 77 | Warm |
| Jun | 82 | Warm |
| Jul | 82 | Tropical |
| Aug | 83 | Tropical |
| Sep | 84 | Tropical |
| Oct | 81 | Warm |
| Nov | 75 | Refreshing |
| Dec | 70 | Refreshing |
UV index in Harlingen in Summer
Clear-sky midday UV across summer averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 7 | 8 | 11 | 9 | 12 | 11 | 11 | 10 | 8 | 6 | 5 |
| Level | Moderate | High | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 7 | High |
| Mar | 8 | Very high |
| Apr | 11 | Extreme |
| May | 9 | Very high |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 5 | Moderate |
Air quality in Harlingen in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 9 | 11 | 13 | 19 | 20 | 25 | 18 | 13 | 7 | 7 | 9 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 11 | Good |
| Apr | 13 | Moderate |
| May | 19 | Moderate |
| Jun | 20 | Moderate |
| Jul | 25 | Moderate |
| Aug | 18 | Moderate |
| Sep | 13 | Moderate |
| Oct | 7 | Good |
| Nov | 7 | Good |
| Dec | 9 | Good |
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.
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
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.