La Unión in Summer
In summer (December, January and February), La Unión sees average daytime highs around 30°C and overnight lows near 22°C, with 69 mm of rain over about 11 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 28°C in early December to 31°C by late February. The sky is clear or mostly clear about 24% of the time across summer, and the air most often feels muggy.
Summer is La Unión's weakest season of the year to visit on our travel score. For the whole year in context, see La Unión's year-round climate.
- Avg daytime high
- 30°C
- 2nd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 69 mm
- 11 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.6
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in La Unión in Summer
Over the season highs climb from about 28°C in early December to 31°C by late February.
A typical summer day in La Unión reaches about 30°C and drops to 22°C overnight. The warmest of the three months is February, the coolest December.
How summer really feels in La Unión
Once humidity and wind are folded in, summer brings about 38 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
La Unión weather by month
How the three summer months (December, January and February) 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 | 30° / 22° | 23 | 2.7 | 12.3 | 5.5 |
| Feb | 31° / 23° | 37 | 5.6 | 12.2 | 4.7 |
| Mar | 31° / 23° | 58 | 6.9 | 12 | 4.5 |
| Apr | 30° / 22° | 21 | 3.6 | 11.9 | 5.6 |
| May | 29° / 20° | 3 | 1.1 | 11.8 | 7.1 |
| Jun | 26° / 19° | 1 | 0.3 | 11.7 | 8.4 |
| Jul | 25° / 18° | 0 | 0.1 | 11.7 | 8.8 |
| Aug | 25° / 17° | 0 | 0.1 | 11.8 | 9.0 |
| Sep | 26° / 17° | 1 | 0.3 | 12 | 8.5 |
| Oct | 26° / 18° | 2 | 0.8 | 12.1 | 8.1 |
| Nov | 27° / 18° | 4 | 1.2 | 12.2 | 7.7 |
| Dec | 29° / 20° | 10 | 2.6 | 12.3 | 6.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 24% of the time across summer.
Chance of precipitation in Summer
La Unión gets around 69 mm of rain over 11 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 12 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 18 min in early December to 12 h 06 min by late February. 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 6.1 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. The water and warmth also suit a beach or pool day.
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 30°C and nights near 22°C. Pack light clothes and sun protection. About 11 days see rain.
Sea temperature near La Unión in Summer
The nearest coast averages about 21°C 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 29 km away) is warmest in February at about 23°C and coldest in September near 18°C.
It's comfortable for a long swim from Dec 25 to May 15 — about 4.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 21 | 23 | 23 | 21 | 20 | 19 | 18 | 18 | 18 | 18 | 19 | 20 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 21 | Refreshing |
| May | 20 | Refreshing |
| Jun | 19 | Cool |
| Jul | 18 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 18 | Cool |
| Nov | 19 | Cool |
| Dec | 20 | Cool |
UV index in La Unión in Summer
Clear-sky midday UV across summer averages around 15 (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 June 22 at about 10 (very high).
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 | 13 | 12 | 10 | 10 | 11 | 12 | 14 | 13 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 16 | Extreme |
| Mar | 16 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 14 | Extreme |
| Nov | 13 | Extreme |
| Dec | 13 | Extreme |
Where is La Unión?
La Unión sits at 5.4°S, 80.7°W, 15 m above sea level, in Peru. The nearest listed city is Catacaos, 16 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 only modest variations in elevation — a maximum elevation change of 25 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 76 m; within 80 km, significant variations in elevation — a maximum elevation change of 588 m.
The land around La Unión is covered by cropland (57%) within 3 km, bare terrain (50%) and cropland (33%) within 16 km, and bare terrain (47%) and water (24%) within 80 km.
Peru travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B / C
- 220 V · 60 Hz
- Prices
- ≈ 51% of US
- price level, 2025
- GDP per capita
- $9,684
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 49%
- of population, 2024
- Homicide rate
- 8.6
- per 100k, 2021
- Road deaths
- 13.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 519
- 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 (-5.4023°, -80.7422°, elevation 15 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.