Ílhavo weather in May

In May, Ílhavo sees average daytime highs of 20°C and overnight lows near 13°C, with 72 mm of rain across 9 wet days and about 14.2 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 40% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of May to 14 h 42 min by month's end. Set against the rest of the year, May is Ílhavo's 5th-clearest and 8th-windiest month. For the whole year in context, see Ílhavo's year-round climate.

Daytime high
20°
6th warmest
Overnight low
13°
7th coldest
Rainfall
72 mm
9 wet days
Daylight
14 h 18 min
5:23 AM – 7:38 PM
Cloud cover
49%
5th clearest
Wind
15 km/h
8th windiest
Solar energy
6.55 kWh/m²
Travel score
6.6
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 May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 21°C by the end.

A typical May day in Ílhavo reaches about 20°C in the afternoon and slips back to 13°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, May runs about 2°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
11812
21812
31812
41912
51912
61913
71913
81913
91913
101913
111913
121913
131913
141913
152013
162013
172013
182014
192014
202014
212014
222014
232014
242114
252114
262114
272114
282114
292115
302115
312115

Ílhavo weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 8th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35842
45842
55842
65842
75941
85842
95842
105842
115842
125842
135842
145842
155842
165842
175941
185941
195941
206040
216040
226139
236139
246238
256238
266337
276337
286337
296337
306337
316337

Chance of precipitation in May

Any precipitation

Ílhavo gets around 72 mm of rain over 9 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 33% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
133
233
333
433
533
633
733
833
933
1033
1133
1232
1332
1432
1531
1631
1730
1829
1929
2028
2127
2227
2326
2426
2525
2625
2724
2824
2924
3023
3123

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
179201
278211
377221
476231
576231
675241
773252
872262
972262
1071272
1169283
1268293
1368293
1466304
1565314
1663325
1763325
1861336
1960346
2058357
2157358
2256368
2354379
24523810
25504010
26484111
27474211
28454312
29444412
30424513
31414613

Wind in May

Winds average 15 km/h in May.

Across May, daily wind ranges from about 15 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
716light breeze
816light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 5:41 AM to 5:12 AM, and sunset from 7:23 PM to 7:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:417:23
213.75:397:24
313.85:387:25
413.85:377:26
513.95:367:27
613.95:347:28
713.95:337:29
814.05:327:30
914.05:317:31
1014.05:307:32
1114.15:297:33
1214.15:277:35
1314.25:267:36
1414.25:257:37
1514.25:247:37
1614.35:237:38
1714.35:227:39
1814.35:227:40
1914.35:217:41
2014.45:207:42
2114.45:197:43
2214.45:187:44
2314.55:177:45
2414.55:177:46
2514.55:167:47
2614.55:157:48
2714.65:157:49
2814.65:147:49
2914.65:137:50
3014.65:137:51
3114.75:127:52

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.55 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 — May's 6.55 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.4Intense
126.4Intense
136.4Intense
146.5Intense
156.5Intense
166.5Intense
176.6Intense
186.6Intense
196.6Intense
206.7Intense
216.7Intense
226.7Intense
236.8Intense
246.8Intense
256.8Intense
266.8Intense
276.8Intense
286.8Intense
296.9Intense
306.9Intense
316.9Intense
Planning a trip in May

Hazard calendar for Ílhavo

In seasonPeak

In May, Ílhavo sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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 May a good time to visit Ílhavo?

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

6.6
Sightseeing
5th-best month of the year
3.3
Beach & pool
6th-best month of the year

May is a reasonable time to visit Ílhavo for sightseeing.

What to pack for Ílhavo in May

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

In May, Ílhavo sees daytime highs around 20°C and nights near 13°C. Pack sun protection. Worth having: rain gear. About 9 days see rain.

sun protectionrain gear

Sea temperature near Ílhavo in May

The nearest coast averages about 16°C in May — 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 May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).