Estoril weather in May

In May, Estoril sees average daytime highs of 17°C and overnight lows near 15°C, with 40 mm of rain across 5.4 wet days and about 14.1 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 55% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of May to 14 h 30 min by month's end. Set against the rest of the year, May is Estoril's 5th-clearest and 7th-windiest month. For the whole year in context, see Estoril's year-round climate.

Daytime high
17°
6th warmest
Overnight low
15°
7th coldest
Rainfall
40 mm
5.4 wet days
Daylight
14 h 06 min
5:31 AM – 7:37 PM
Cloud cover
40%
5th clearest
Wind
24 km/h
7th windiest
Solar energy
6.8 kWh/m²
Travel score
6.1
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical May day in Estoril reaches about 17°C in the afternoon and slips back to 15°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 18°C. Set against its neighbours, May runs about 1°C warmer than April and about 2°C cooler than June.

10°13°15°18°20°151015202531
Avg high (°C)Avg low (°C)
11614
21614
31614
41614
51615
61615
71615
81615
91615
101615
111615
121615
131615
141615
151615
161615
171715
181715
191715
201715
211715
221716
231716
241716
251716
261716
271716
281716
291716
301716
311716

Estoril 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° / 12°8110.29.64.3
Feb14° / 12°608.210.54.3
Mar15° / 13°568.111.74.7
Apr15° / 14°507.8135.1
May17° / 15°405.414.16.1
Jun18° / 17°81.814.77.5
Jul19° / 18°20.614.48.2
Aug19° / 18°40.813.58.2
Sep19° / 18°273.812.37.5
Oct19° / 17°809116.3
Nov17° / 15°9510.69.95.3
Dec15° / 13°8910.69.34.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 16% of May, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26832
36832
46832
56931
66931
76832
86931
96931
107030
116931
127030
137030
147129
157129
167228
177228
187228
197327
207426
217426
227525
237525
247525
257525
267525
277525
287525
297525
307525
317426

Chance of precipitation in May

Any precipitation

Estoril gets around 40 mm of rain over 5.4 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 17% and peaks near 23% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
123
222
322
422
522
622
721
821
920
1020
1119
1219
1318
1418
1518
1617
1717
1816
1916
2016
2115
2215
2314
2414
2514
2613
2713
2812
2912
3011
3111

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 48% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
168311
267321
366322
465332
564342
664342
763352
861372
959383
1058393
1157403
1255423
1353434
1452444
1551454
1649465
1747485
1845496
1943507
2042508
2140528
2238539
23365410
24355411
25335512
26325513
27305614
28295615
29285517
30275518
31265519

Wind in May

Winds average 24 km/h in May.

Across May, daily wind ranges from about 23 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
124breezy
224breezy
324breezy
424breezy
524breezy
624breezy
724breezy
824breezy
924breezy
1024breezy
1124breezy
1224breezy
1324breezy
1424breezy
1524breezy
1624breezy
1724breezy
1824breezy
1924breezy
2024breezy
2124breezy
2223breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2823breezy
2923breezy
3023breezy
3123breezy

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 36 min at the start of May to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:47 AM to 5:21 AM, and sunset from 7:23 PM to 7:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:477:23
213.65:467:24
313.75:447:25
413.75:437:26
513.75:427:27
613.85:417:27
713.85:407:28
813.85:397:29
913.95:387:30
1013.95:377:31
1113.95:367:32
1214.05:357:33
1314.05:347:34
1414.05:337:35
1514.15:327:36
1614.15:317:37
1714.15:307:38
1814.25:297:39
1914.25:287:40
2014.25:277:40
2114.25:277:41
2214.35:267:42
2314.35:257:43
2414.35:257:44
2514.35:247:45
2614.45:237:46
2714.45:237:46
2814.45:227:47
2914.45:227:48
3014.55:217:49
3114.55:217:49

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.8 kWh/m².

For context, solar energy here swings from a low near 2.01 kWh/m² to a high of 7.51 kWh/m² in July across the year — May's 6.8 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.6Intense
96.6Intense
106.6Intense
116.7Intense
126.7Intense
136.7Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.9Intense
196.9Intense
206.9Intense
217.0Intense
227.0Intense
237.0Intense
247.0Intense
257.0Intense
267.0Intense
277.1Intense
287.1Intense
297.1Intense
307.1Intense
317.1Intense
Planning a trip in May

Hazard calendar for Estoril

In seasonPeak

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

Estoril's rainy season runs October–April, 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 Estoril?

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

6.1
Sightseeing
6th-best month of the year
1.1
Beach & pool
6th-best month of the year

May is a reasonable time to visit Estoril for sightseeing.

What to pack for Estoril in May

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

In May, Estoril sees daytime highs around 17°C and nights near 15°C. Pack sun protection. Worth having: a warm layer and a windbreaker. About 5 days see rain.

sun protectiona warm layera windbreaker

Sea temperature near Estoril 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 offshore 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.

14°16°18°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan15Cool
Feb15Bracing
Mar15Bracing
Apr15Cool
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec16Cool

UV index in Estoril 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 Estoril 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 15UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct5High
Nov3Moderate
Dec2Low
Location & terrain

Where is Estoril?

Estoril sits at 38.7°N, 9.4°W, 24 m above sea level, in Portugal. The nearest listed city is Monte Estoril, 1.0 km away.

Topography around Estoril

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

Within 3 km, the terrain around Estoril has only modest variations in elevation — a maximum elevation change of 145 m around an average of 42 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 513 m; within 80 km, large variations in elevation — a maximum elevation change of 651 m.

The land around Estoril is covered by artificial surfaces (38%) and water (31%) within 3 km, water (56%) within 16 km, and water (49%) and grassland (24%) within 80 km.

3 km
145 m
16 km
513 m
80 km
651 m
treesshrubsgrasslandcroplandartificial surfaceswater
May weather nearby: Monte Estoril 1.0 km · Cascais 2.0 km · Alcabideche 3.0 km · Parede 4.0 km · São Domingos de Rana 5.0 km · Carcavelos 7.0 km · Oeiras 8.0 km · Rio de Mouro 9.0 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 Estoril (38.7057°, -9.3977°, elevation 24 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).