La Unión in Summer
In summer (June, July and August), La Unión sees average daytime highs around 26°C and overnight lows near 18°C, with 1476 mm of rain over about 90 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 26°C. The sky is clear or mostly clear about 0% of the time across summer, and the air most often feels muggy.
Summer is La Unión's 3rd-best season 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
- 26°C
- 2nd-warmest season
- Avg overnight low
- 18°C
- Rainfall
- 1476 mm
- 90 wet days
- Avg wind
- 3 km/h
- Travel score
- 3.4
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in La Unión in Summer
Across summer, daytime highs hold fairly steady around 26°C.
A typical summer day in La Unión reaches about 26°C and drops to 18°C overnight. The warmest of the three months is August, the coolest August.
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 | 26° / 18° | 348 | 29.3 | 11.8 | 3.7 |
| Feb | 26° / 18° | 388 | 26.6 | 11.9 | 3.6 |
| Mar | 26° / 18° | 508 | 30 | 12 | 3.5 |
| Apr | 26° / 18° | 670 | 29.5 | 12.1 | 3.4 |
| May | 26° / 18° | 697 | 30.7 | 12.2 | 3.3 |
| Jun | 26° / 18° | 552 | 29.7 | 12.3 | 3.4 |
| Jul | 26° / 18° | 475 | 30.2 | 12.2 | 3.4 |
| Aug | 26° / 18° | 449 | 30.1 | 12.1 | 3.4 |
| Sep | 26° / 18° | 567 | 29.2 | 12 | 3.4 |
| Oct | 25° / 18° | 609 | 30.3 | 11.9 | 3.4 |
| Nov | 25° / 18° | 587 | 29.2 | 11.8 | 3.5 |
| Dec | 26° / 18° | 439 | 30.3 | 11.7 | 3.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 0% of the time across summer.
Chance of precipitation in Summer
La Unión gets around 1476 mm of rain over 90 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 3 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 12 min in early June to 12 h 06 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 4.2 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 weaker month for outdoor sightseeing in La Unión.
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 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 90 days see rain.
UV index in La Unión in Summer
Clear-sky midday UV across summer averages around 12 (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 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 11 (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) | 13 | 15 | 15 | 11 | 14 | 12 | 13 | 12 | 14 | 14 | 12 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 11 | Extreme |
| May | 14 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 12 | Extreme |
| Sep | 14 | Extreme |
| Oct | 14 | Extreme |
| Nov | 12 | Extreme |
| Dec | 11 | 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 35 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 19 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) | 28 | 32 | 35 | 30 | 24 | 21 | 19 | 22 | 25 | 23 | 22 | 26 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 28 | Moderate |
| Feb | 32 | Moderate |
| Mar | 35 | Moderate |
| Apr | 30 | Moderate |
| May | 24 | Moderate |
| Jun | 21 | Moderate |
| Jul | 19 | Moderate |
| Aug | 22 | Moderate |
| Sep | 25 | Moderate |
| Oct | 23 | Moderate |
| Nov | 22 | Moderate |
| Dec | 26 | Moderate |
Where is La Unión?
La Unión sits at 4.5°N, 76.1°W, 967 m above sea level, in Colombia. The nearest listed city is Roldanillo, 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 significant variations in elevation — a maximum elevation change of 504 m around an average of 1,031 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,272 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,598 m.
The land around La Unión is covered by grassland (62%) and trees (28%) within 3 km, grassland (50%) and trees (31%) within 16 km, and trees (74%) 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 (4.5328°, -76.1032°, elevation 967 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.