Barreiro in Summer
In summer (June, July and August), Barreiro sees average daytime highs around 27°C and overnight lows near 17°C, with 17 mm of rain over about 4 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 24°C in early June to 28°C by late August. The sky is clear or mostly clear about 75% of the time across summer, and the air most often feels comfortable.
Summer is Barreiro's best season of the year to visit on our travel score. For the whole year in context, see Barreiro's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 17 mm
- 4 wet days
- Avg wind
- 15 km/h
- Travel score
- 8.2
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Barreiro in Summer
Over the season highs climb from about 24°C in early June to 28°C by late August.
A typical summer day in Barreiro reaches about 27°C and drops to 17°C overnight. The warmest of the three months is August, the coolest June.
Barreiro 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 | 14° / 8° | 61 | 8.4 | 9.6 | 4.4 |
| Feb | 15° / 8° | 47 | 7 | 10.5 | 5.0 |
| Mar | 18° / 10° | 51 | 7.6 | 11.7 | 6.2 |
| Apr | 19° / 11° | 51 | 8.6 | 13 | 6.5 |
| May | 22° / 13° | 42 | 6.3 | 14.1 | 7.5 |
| Jun | 25° / 16° | 10 | 2.4 | 14.6 | 8.5 |
| Jul | 28° / 17° | 2 | 0.7 | 14.4 | 8.2 |
| Aug | 28° / 17° | 5 | 1 | 13.5 | 7.9 |
| Sep | 26° / 16° | 28 | 4.4 | 12.3 | 8.0 |
| Oct | 22° / 14° | 75 | 8.8 | 11 | 7.0 |
| Nov | 17° / 11° | 75 | 9.2 | 9.9 | 5.8 |
| Dec | 15° / 9° | 73 | 8.9 | 9.3 | 4.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 75% of the time across summer.
Chance of precipitation in Summer
Barreiro gets around 17 mm of rain over 4 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 15 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 30 min in early June to 12 h 54 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 7.3 kWh/m².
Is summer a good time to visit Barreiro?
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 one of the better times to visit Barreiro for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Barreiro in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Barreiro sees daytime highs around 27°C and nights near 17°C. Pack light clothes and sun protection.
Sea temperature near Barreiro in Summer
The nearest coast averages about 18°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 27 km away) is warmest in September at about 19°C and coldest in February near 15°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 15 | 15 | 15 | 16 | 18 | 18 | 19 | 19 | 18 | 17 | 16 |
| Comfort | Cool | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Cool |
| Feb | 15 | Bracing |
| Mar | 15 | Bracing |
| Apr | 15 | Cool |
| May | 16 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 19 | Cool |
| Sep | 19 | Cool |
| Oct | 18 | Cool |
| Nov | 17 | Cool |
| Dec | 16 | Cool |
UV index in Barreiro in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Barreiro peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 6 | 8 | 7 | 9 | 9 | 9 | 6 | 5 | 3 | 2 |
| Level | Low | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 6 | High |
| Apr | 8 | Very high |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Where is Barreiro?
Barreiro sits at 38.7°N, 9.1°W, 7 m above sea level, in Portugal. The nearest listed city is Lavradio, 2.0 km away.
Topography around Barreiro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Barreiro.
Within 3 km, the terrain around Barreiro has only modest variations in elevation — a maximum elevation change of 46 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 248 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.
The land around Barreiro is covered by water (57%) and artificial surfaces (25%) within 3 km, grassland (27%), water (27%) and artificial surfaces (24%) within 16 km, and water (37%) and grassland (33%) within 80 km.
Portugal travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $32,082
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 95%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2022
- Road deaths
- 8.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 612
- 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 Barreiro (38.6631°, -9.0724°, elevation 7 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.