Leiria weather in May

In May, Leiria sees average daytime highs of 21°C and overnight lows near 12°C, with 63 mm of rain across 8.7 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 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 39% 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 36 min by month's end. Set against the rest of the year, May is Leiria's 5th-clearest and 7th-windiest month. For the whole year in context, see Leiria's year-round climate.

Daytime high
21°
6th warmest
Overnight low
12°
7th coldest
Rainfall
63 mm
8.7 wet days
Daylight
14 h 12 min
5:26 AM – 7:37 PM
Cloud cover
50%
5th clearest
Wind
14 km/h
7th windiest
Solar energy
6.63 kWh/m²
Travel score
6.9
out of 10

Leiria is city seat of Leiria municipality.

Air quality
Moderate
PM2.5 11.8 µg/m³ · 2010

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 20°C in the first days to 22°C by the end.

A typical May day in Leiria reaches about 21°C in the afternoon and slips back to 12°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
11911
21911
32011
42011
52011
62011
72011
82011
92011
102011
112011
122111
132112
142112
152112
162112
172112
182112
192112
202212
212212
222212
232213
242213
252213
262213
272213
282213
292213
302313
312313

Leiria 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° / 8810.59.53.9
Feb15° / 668.610.44.6
Mar17° / 709.611.75.8
Apr19° / 10°7310.5136.0
May21° / 12°638.714.26.9
Jun24° / 14°183.814.88.3
Jul26° / 15°61.814.58.7
Aug26° / 15°102.113.68.5
Sep25° / 14°415.612.38.0
Oct21° / 13°9610.410.96.5
Nov17° / 9811.69.85.2
Dec14° / 9210.49.24.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 42%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25446
35446
45446
55446
65446
75446
85446
95446
105446
115545
125545
135743
145743
155842
165842
175941
186040
196040
206139
216139
226139
236238
246238
256337
266337
276337
286337
296337
306238
316238

Chance of precipitation in May

Any precipitation

Leiria gets around 63 mm of rain over 8.7 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 28% and peaks near 31% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
330
430
530
630
730
830
930
1030
1130
1230
1330
1430
1530
1629
1729
1829
1928
2028
2127
2227
2327
2426
2525
2625
2724
2823
2923
3022
3122

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 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
185141
284151
384151
483161
583161
682171
782171
881181
981181
1080191
1179201
1278202
1377212
1476222
1575232
1674242
1773252
1871263
1971263
2070273
2169283
2267294
2366304
2465314
2563325
2662335
2761345
2860355
2958366
3057376
3156386

Wind in May

Winds average 14 km/h in May.

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

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light 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 May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 36 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 5:43 AM to 5:15 AM, and sunset from 7:22 PM to 7:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:437:22
213.75:417:23
313.75:407:24
413.85:397:25
513.85:387:26
613.85:377:27
713.95:357:28
813.95:347:29
914.05:337:30
1014.05:327:31
1114.05:317:32
1214.15:307:33
1314.15:297:34
1414.15:287:35
1514.25:277:36
1614.25:267:37
1714.25:257:38
1814.25:247:39
1914.35:237:40
2014.35:237:41
2114.35:227:42
2214.45:217:42
2314.45:207:43
2414.45:197:44
2514.45:197:45
2614.55:187:46
2714.55:187:47
2814.55:177:48
2914.55:167:48
3014.65:167:49
3114.65:157:50

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.63 kWh/m².

For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 7.48 kWh/m² in July across the year — May's 6.63 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.4Intense
96.4Intense
106.4Intense
116.5Intense
126.5Intense
136.5Intense
146.6Intense
156.6Intense
166.6Intense
176.7Intense
186.7Intense
196.7Intense
206.8Intense
216.8Intense
226.8Intense
236.8Intense
246.9Intense
256.9Intense
266.9Intense
276.9Intense
286.9Intense
297.0Intense
307.0Intense
317.0Intense
Planning a trip in May

Hazard calendar for Leiria

In seasonPeak

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

Leiria'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 Leiria?

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

6.9
Sightseeing
5th-best month of the year
4.2
Beach & pool
5th-best month of the year

May is a reasonable time to visit Leiria for sightseeing.

What to pack for Leiria in May

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

In May, Leiria sees daytime highs around 21°C and nights near 12°C. Pack sun protection. Worth having: rain gear. About 9 days see rain.

sun protectionrain gear

Sea temperature near Leiria 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 30 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
Apr15Cool
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Leiria 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 Leiria 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 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

Air quality in Leiria 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 Leiria is worst in August — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Leiria's WHO annual average of 11.8 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateModerateGoodAug 1816 µg/m³Nov 238 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar14Moderate
Apr12Moderate
May10Good
Jun13Moderate
Jul11Good
Aug16Moderate
Sep13Moderate
Oct16Moderate
Nov8Good
Dec8Good
Location & terrain

Where is Leiria?

Leiria sits at 39.7°N, 8.8°W, 33 m above sea level, in Portugal. The nearest listed city is Marinha Grande, 11 km away.

Topography around Leiria

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

Within 3 km, the terrain around Leiria has only modest variations in elevation — a maximum elevation change of 138 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 520 m; within 80 km, large variations in elevation — a maximum elevation change of 1,199 m.

The land around Leiria is covered by trees (37%), artificial surfaces (34%) and grassland (23%) within 3 km, trees (60%) and grassland (26%) within 16 km, and trees (47%), water (24%) and grassland (21%) within 80 km.

3 km
138 m
16 km
520 m
80 km
1,199 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Marinha Grande 11 km · Pombal 25 km · Alcobaça 26 km · Monsanto 32 km · Torres Novas 37 km · Tomar 38 km · Entroncamento 42 km · Figueira da Foz 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 Leiria (39.7436°, -8.8071°, elevation 33 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).