La Unión in Summer
In summer (June, July and August), La Unión sees average daytime highs around 24°C and overnight lows near 15°C, with 597 mm of rain over about 63 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across summer, daytime highs hold fairly steady around 24°C. The sky is clear or mostly clear about 5% of the time across summer, and the air most often feels comfortable.
Summer is La Unión's best season of the year to visit on our travel score. La Unión has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see La Unión's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 15°C
- Rainfall
- 597 mm
- 63 wet days
- Avg wind
- 4 km/h
- Travel score
- 5.0
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in La Unión in Summer
Across summer, daytime highs hold fairly steady around 24°C.
A typical summer day in La Unión reaches about 24°C and drops to 15°C overnight. The warmest of the three months is August, the coolest July.
La Unión 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 (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 22° / 15° | 342 | 29.2 | 11.9 | 3.7 |
| Feb | 23° / 15° | 343 | 26.3 | 11.9 | 3.6 |
| Mar | 23° / 15° | 401 | 29.6 | 12 | 3.6 |
| Apr | 23° / 15° | 441 | 29.3 | 12 | 3.5 |
| May | 23° / 15° | 392 | 29.1 | 12.1 | 3.6 |
| Jun | 23° / 15° | 270 | 24.3 | 12.1 | 4.3 |
| Jul | 24° / 15° | 181 | 20.1 | 12.1 | 5.2 |
| Aug | 24° / 15° | 147 | 18.4 | 12.1 | 5.4 |
| Sep | 24° / 15° | 258 | 24.5 | 12 | 4.3 |
| Oct | 23° / 15° | 381 | 29.6 | 12 | 3.6 |
| Nov | 22° / 15° | 393 | 28.9 | 11.9 | 3.4 |
| Dec | 22° / 15° | 388 | 29.6 | 11.9 | 3.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 5% of the time across summer.
Chance of precipitation in Summer
La Unión gets around 597 mm of rain over 63 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 4 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 06 min in early June to 12 hours 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 5.1 kWh/m².
Is summer a good time to visit La Unión?
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 reasonable time to visit La Unión for sightseeing.
What to pack for La Unión in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, La Unión sees daytime highs around 24°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 63 days see rain.
UV index in La Unión in Summer
Clear-sky midday UV across summer averages 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 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 16 | 16 | 14 | 15 | 13 | 12 | 12 | 14 | 14 | 13 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 16 | Extreme |
| Mar | 16 | Extreme |
| Apr | 14 | Extreme |
| May | 15 | Extreme |
| Jun | 13 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 14 | Extreme |
| Oct | 14 | Extreme |
| Nov | 13 | Extreme |
| Dec | 13 | Extreme |
Air quality in La Unión 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 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 18 | 18 | 16 | 13 | 11 | 11 | 14 | 17 | 15 | 14 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 18 | Moderate |
| Mar | 18 | Moderate |
| Apr | 16 | Moderate |
| May | 13 | Moderate |
| Jun | 11 | Good |
| Jul | 11 | Good |
| Aug | 14 | Moderate |
| Sep | 17 | Moderate |
| Oct | 15 | Moderate |
| Nov | 14 | Moderate |
| Dec | 14 | Moderate |
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.
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
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.