Caldas da Rainha weather in May

In May, Caldas da Rainha sees average daytime highs of 19°C and overnight lows near 14°C, with 45 mm of rain across 7.2 wet days and about 14.1 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 20°C by the end. The sky is clear or mostly clear about 43% 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 Caldas da Rainha's 5th-clearest and 5th-windiest month. For the whole year in context, see Caldas da Rainha's year-round climate.

Daytime high
19°
6th warmest
Overnight low
14°
7th coldest
Rainfall
45 mm
7.2 wet days
Daylight
14 h 12 min
5:28 AM – 7:37 PM
Cloud cover
47%
5th clearest
Wind
19 km/h
5th windiest
Solar energy
6.72 kWh/m²
Travel score
6.7
out of 10

Caldas da Rainha is human settlement in Portugal.

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 20°C by the end.

A typical May day in Caldas da Rainha reaches about 19°C in the afternoon and slips back to 14°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°C. Set against its neighbours, May runs about 2°C warmer than April and about 2°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11713
21713
31813
41813
51814
61814
71814
81814
91814
101814
111814
121814
131814
141814
151914
161914
171914
181914
191915
201915
211915
221915
231915
241915
252015
262015
272015
282015
292015
302015
312015

Caldas da Rainha 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° / 10°7710.39.54.0
Feb14° / 11°558.210.54.4
Mar16° / 12°538.511.75.2
Apr17° / 13°549.3135.6
May19° / 14°457.214.16.7
Jun21° / 16°143.614.77.7
Jul22° / 17°61.814.58.6
Aug23° / 18°71.813.58.7
Sep22° / 17°314.812.37.8
Oct20° / 16°8210116.4
Nov17° / 13°8811.39.85.2
Dec15° / 11°799.99.34.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 20% of May, with mostly cloudy or overcast conditions the remaining 37%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
46040
56040
66040
76040
85941
96040
106040
116040
126040
136139
146139
156238
166238
176337
186337
196436
206436
216535
226535
236634
246634
256733
266634
276634
286733
296733
306634
316634

Chance of precipitation in May

Any precipitation

Caldas da Rainha gets around 45 mm of rain over 7.2 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 23% and peaks near 27% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
127
226
326
426
526
626
726
826
926
1026
1125
1225
1325
1424
1524
1623
1723
1823
1922
2022
2122
2221
2321
2420
2519
2619
2718
2818
2918
3018
3117

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 56% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
173261
272271
371281
471281
570291
669301
769301
867312
966322
1065332
1164342
1262353
1361363
1460373
1558384
1657394
1755405
1855405
1953416
2052426
2150437
2249438
2347449
2445459
25444610
26424711
27414811
28394912
29384913
30375013
31355114

Wind in May

Winds average 19 km/h in May.

Across May, daily wind ranges from about 19 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze
3119light breeze

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 5:45 AM to 5:18 AM, and sunset from 7:23 PM to 7:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:457:23
213.75:437:24
313.75:427:25
413.75:417:26
513.85:407:27
613.85:397:28
713.95:377:29
813.95:367:30
913.95:357:31
1014.05:347:32
1114.05:337:33
1214.05:327:34
1314.15:317:35
1414.15:307:36
1514.15:297:37
1614.25:287:37
1714.25:277:38
1814.25:267:39
1914.25:267:40
2014.35:257:41
2114.35:247:42
2214.35:237:43
2314.45:227:44
2414.45:227:45
2514.45:217:45
2614.45:207:46
2714.55:207:47
2814.55:197:48
2914.55:197:49
3014.55:187:50
3114.55:187:50

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.72 kWh/m².

For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 7.39 kWh/m² in July across the year — May's 6.72 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.4Intense
46.4Intense
56.4Intense
66.4Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.6Intense
126.6Intense
136.6Intense
146.7Intense
156.7Intense
166.7Intense
176.8Intense
186.8Intense
196.8Intense
206.8Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
257.0Intense
267.0Intense
277.0Intense
287.0Intense
297.0Intense
307.0Intense
317.0Intense
Planning a trip in May

Is May a good time to visit Caldas da Rainha?

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

6.7
Sightseeing
5th-best month of the year
2.6
Beach & pool
6th-best month of the year

May is a reasonable time to visit Caldas da Rainha for sightseeing.

What to pack for Caldas da Rainha in May

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

In May, Caldas da Rainha sees daytime highs around 19°C and nights near 14°C. Pack sun protection. About 7 days see rain.

sun protection

Sea temperature near Caldas da Rainha 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 21 km away) is warmest in August at about 19°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Bracing
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Caldas da Rainha 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 Caldas da Rainha peaks around July 14 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 highVery highHighModerateLowJul 14UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr7Very high
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Caldas da Rainha?

Caldas da Rainha sits at 39.4°N, 9.1°W, 60 m above sea level, in Portugal. The nearest listed city is Peniche, 22 km away.

Topography around Caldas da Rainha

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

Within 3 km, the terrain around Caldas da Rainha has only modest variations in elevation — a maximum elevation change of 141 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 329 m; within 80 km, large variations in elevation — a maximum elevation change of 673 m.

The land around Caldas da Rainha is covered by grassland (39%), trees (33%) and artificial surfaces (23%) within 3 km, trees (43%) and grassland (30%) within 16 km, and water (32%), trees (31%) and grassland (26%) within 80 km.

3 km
141 m
16 km
329 m
80 km
673 m
treesshrubsgrasslandcroplandartificial surfaceswater
May weather nearby: Peniche 22 km · Alcobaça 22 km · Torres Vedras 36 km · Monsanto 37 km · Marinha Grande 42 km · Santarém 43 km · Azambuja 44 km · Leiria 47 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 Caldas da Rainha (39.4033°, -9.1384°, elevation 60 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).