La Unión in Spring
In spring (September, October and November), La Unión sees average daytime highs around 26°C and overnight lows near 18°C, with 7 mm of rain over about 2 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 25°C in early September to 28°C by late November. The sky is clear or mostly clear about 40% of the time across spring, and the air most often feels humid.
Spring is La Unión's 2nd-best season to visit on our travel score. For the whole year in context, see La Unión's year-round climate.
- Avg daytime high
- 26°C
- 3rd-warmest season
- Avg overnight low
- 18°C
- Rainfall
- 7 mm
- 2 wet days
- Avg wind
- 15 km/h
- Travel score
- 8.1
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in La Unión in Spring
Over the season highs climb from about 25°C in early September to 28°C by late November.
A typical spring day in La Unión reaches about 26°C and drops to 18°C overnight. The warmest of the three months is November, the coolest September.
How spring really feels in La Unión
Once humidity and wind are folded in, spring brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
spring sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
La Unión weather by month
How the three spring months (September, October and November) 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 Spring
The sky is clear or mostly clear about 40% of the time across spring.
Chance of precipitation in Spring
La Unión gets around 7 mm of rain over 2 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 15 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 54 min in early September to 12 h 18 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.5 kWh/m².
Is spring a good time to visit La Unión?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is one of the better times to visit La Unión for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for La Unión in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, La Unión sees daytime highs around 26°C and nights near 18°C. Pack light clothes and sun protection.
Sea temperature near La Unión in Spring
The nearest coast averages about 18°C across spring — 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 Spring
Clear-sky midday UV across spring 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 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.