Aveiro in Summer
In summer (June, July and August), Aveiro sees average daytime highs around 23°C and overnight lows near 17°C, with 55 mm of rain over about 11 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 21°C in early June to 24°C by late August. The sky is clear or mostly clear about 65% of the time across summer, and the air most often feels humid.
Summer is Aveiro's best season of the year to visit on our travel score. For the whole year in context, see Aveiro's year-round climate.
- Avg daytime high
- 23°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 55 mm
- 11 wet days
- Avg wind
- 15 km/h
- Travel score
- 8.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Aveiro in Summer
Over the season highs climb from about 21°C in early June to 24°C by late August.
A typical summer day in Aveiro reaches about 23°C and drops to 17°C overnight. The warmest of the three months is August, the coolest June.
Aveiro 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° | 128 | 12.1 | 9.4 | 3.8 |
| Feb | 14° / 9° | 88 | 9.3 | 10.4 | 4.4 |
| Mar | 16° / 10° | 95 | 9.9 | 11.7 | 5.3 |
| Apr | 17° / 11° | 98 | 10.9 | 13.1 | 5.7 |
| May | 20° / 13° | 79 | 9.6 | 14.2 | 6.5 |
| Jun | 22° / 16° | 26 | 5 | 14.9 | 7.8 |
| Jul | 24° / 17° | 12 | 2.7 | 14.6 | 8.8 |
| Aug | 24° / 17° | 17 | 3.4 | 13.6 | 8.7 |
| Sep | 23° / 16° | 51 | 6 | 12.3 | 7.8 |
| Oct | 20° / 14° | 143 | 12 | 10.9 | 6.1 |
| Nov | 16° / 11° | 145 | 12.7 | 9.7 | 4.9 |
| Dec | 14° / 9° | 141 | 12.2 | 9.1 | 4.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 65% of the time across summer.
Chance of precipitation in Summer
Aveiro gets around 55 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 humid — 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 42 min in early June to 13 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 7.0 kWh/m².
Hazard calendar for Aveiro
None of Aveiro's seasonal hazards peak in summer. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Aveiro's rainy season runs October–May, when most of the year's rain falls.
Is summer a good time to visit Aveiro?
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 Aveiro for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Aveiro in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Aveiro sees daytime highs around 23°C and nights near 17°C. Pack sun protection. Worth having: light clothes. About 11 days see rain.
Sea temperature near Aveiro 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 19 km away) is warmest in August at about 18°C and coldest in February near 14°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) | 14 | 14 | 14 | 15 | 16 | 17 | 18 | 18 | 18 | 17 | 16 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Bracing |
| May | 16 | Cool |
| Jun | 17 | Cool |
| Jul | 18 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 17 | Cool |
| Nov | 16 | Cool |
| Dec | 15 | Bracing |
UV index in Aveiro 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 Aveiro peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 | 5 | 6 | 7 | 9 | 9 | 8 | 5 | 4 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Aveiro 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 Aveiro is worst in October — around 19 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 7 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) | 7 | 9 | 11 | 10 | 8 | 12 | 8 | 14 | 17 | 19 | 7 | 7 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 9 | Good |
| Mar | 11 | Good |
| Apr | 10 | Good |
| May | 8 | Good |
| Jun | 12 | Good |
| Jul | 8 | Good |
| Aug | 14 | Moderate |
| Sep | 17 | Moderate |
| Oct | 19 | Moderate |
| Nov | 7 | Good |
| Dec | 7 | Good |
Where is Aveiro?
Aveiro sits at 40.6°N, 8.6°W, 19 m above sea level, in Portugal. The nearest listed city is Vilar, 2.0 km away.
Topography around Aveiro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Aveiro.
Within 3 km, the terrain around Aveiro has only modest variations in elevation — a maximum elevation change of 55 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 179 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,365 m.
The land around Aveiro is covered by water (37%) and artificial surfaces (31%) within 3 km, trees (31%) and water (29%) within 16 km, and trees (45%), water (26%) and grassland (20%) 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 Aveiro (40.6457°, -8.6464°, elevation 19 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.