Ílhavo weather in August

In August, Ílhavo sees average daytime highs of 24°C and overnight lows near 17°C, with 15 mm of rain across 3.1 wet days and about 13.6 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 70% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Ílhavo's 2nd-clearest and 10th-windiest month. For the whole year in context, see Ílhavo's year-round climate.

Daytime high
24°
1st warmest
Overnight low
17°
12th coldest
Rainfall
15 mm
3.1 wet days
Daylight
13 h 36 min
5:50 AM – 7:28 PM
Cloud cover
27%
2nd clearest
Wind
15 km/h
10th windiest
Solar energy
6.51 kWh/m²
Travel score
8.7
out of 10

Ílhavo is city seat of Ílhavo municipality.

Air quality
Good
PM10 23.2 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical August day in Ílhavo reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12517
22517
32517
42517
52517
62517
72517
82517
92517
102517
112517
122517
132517
142517
152517
162417
172417
182417
192417
202417
212417
222417
232417
242417
252417
262417
272417
282417
292417
302417
312417

Ílhavo weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 11911.69.43.9
Feb15° / 83910.44.4
Mar17° / 10°889.711.75.4
Apr18° / 11°9210.7135.7
May20° / 13°72914.26.6
Jun22° / 16°244.714.87.9
Jul24° / 17°102.214.68.9
Aug24° / 17°153.113.68.7
Sep23° / 16°485.612.37.9
Oct20° / 14°13211.410.96.2
Nov16° / 11°13312.59.75.0
Dec14° / 12911.29.14.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 70% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 15%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18911
28911
38911
48911
58713
68713
78713
88614
98614
108614
118614
128515
138416
148416
158416
168416
178317
188416
198416
208416
218416
228416
238317
248317
258317
268317
278317
288317
298317
308317
318218

Chance of precipitation in August

Any precipitation

Ílhavo gets around 15 mm of rain over 3.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 10% and peaks near 11% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
18
28
38
49
59
69
79
89
99
1010
1110
1210
1310
1410
159
169
179
189
199
2010
2110
2210
2310
2410
2510
2610
2710
2810
2911
3011
3111

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the humid band about 56% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1433585
2533575
3533566
4634546
5634546
6634546
7634546
8634546
9633556
10633556
11633556
12633556
13633556
14532576
15532576
16532576
17532576
18532585
19532585
20532585
21532585
22531595
23631585
24632575
25732574
26732574
27832564
28833563
29933553
30933553
31933553

Wind in August

Winds average 15 km/h in August.

Across August, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 12 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 5:35 AM to 6:05 AM, and sunset from 7:46 PM to 7:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:357:46
214.25:367:45
314.15:377:44
414.15:387:43
514.05:397:42
614.05:407:41
714.05:417:39
813.95:427:38
913.95:437:37
1013.95:447:36
1113.85:457:34
1213.85:467:33
1313.75:477:32
1413.75:487:30
1513.75:497:29
1613.65:507:28
1713.65:517:26
1813.55:527:25
1913.55:537:23
2013.55:547:22
2113.45:557:20
2213.45:567:19
2313.35:577:17
2413.35:587:16
2513.35:597:14
2613.26:007:13
2713.26:017:11
2813.16:027:09
2913.16:037:08
3013.06:047:06
3113.06:057:04

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.51 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 7.33 kWh/m² in July across the year — August's 6.51 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.1Intense
27.0Intense
37.0Intense
47.0Intense
56.9Intense
66.9Intense
76.9Intense
86.8Intense
96.8Intense
106.8Intense
116.7Intense
126.7Intense
136.6Intense
146.6Intense
156.5Intense
166.5Intense
176.5Intense
186.4Intense
196.4Intense
206.3Intense
216.3Intense
226.3Intense
236.2Intense
246.2Intense
256.1Intense
266.1Intense
276.0Intense
286.0Intense
296.0Bright
305.9Bright
315.9Bright
Planning a trip in August

Hazard calendar for Ílhavo

In seasonPeak

None of Ílhavo's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Ílhavo's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Ílhavo?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.7
Sightseeing
2nd-best month of the year
7.6
Beach & pool
1st-best month of the year

August is one of the better times to visit Ílhavo for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Ílhavo in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Ílhavo sees daytime highs around 24°C and nights near 17°C. Pack sun protection. Worth having: light clothes. About 3 days see rain.

sun protectionlight clothes

Sea temperature near Ílhavo in August

The nearest coast averages about 18°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 17 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.

12°14°16°18°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan14Bracing
Feb14Bracing
Mar14Bracing
Apr15Bracing
May16Cool
Jun17Cool
Jul18Cool
Aug18Cool
Sep18Cool
Oct17Cool
Nov16Cool
Dec15Bracing

UV index in Ílhavo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ílhavo 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Ílhavo in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Ílhavo 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).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodOct 1119 µg/m³Nov 237 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar11Good
Apr10Good
May8Good
Jun12Good
Jul8Good
Aug14Moderate
Sep17Moderate
Oct19Moderate
Nov7Good
Dec7Good
Location & terrain

Where is Ílhavo?

Ílhavo sits at 40.6°N, 8.7°W, 13 m above sea level, in Portugal. The nearest listed city is Vilar, 4.0 km away.

Topography around Ílhavo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ílhavo.

Within 3 km, the terrain around Ílhavo has only modest variations in elevation — a maximum elevation change of 55 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,365 m.

The land around Ílhavo is covered by grassland (23%), trees (21%) and artificial surfaces (20%) within 3 km, water (31%) and trees (30%) within 16 km, and trees (46%) and water (27%) within 80 km.

3 km
55 m
16 km
126 m
80 km
1,365 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Vilar 4.0 km · Aveiro 5.0 km · Ovar 29 km · São João da Madeira 37 km · Feira 38 km · Eiras 45 km · Espinho 45 km · São Paulo de Frades 46 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
Catholic 68%not applicable 13%no religion 12%no response 2%

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 Ílhavo (40.6019°, -8.6702°, elevation 13 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).