Ljubljana weather in May

In May, Ljubljana sees average daytime highs of 19°C and overnight lows near 10°C, with 103 mm of rain across 13.5 wet days and about 14.7 hours of daylight. It is the 5th-warmest and 6th-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 28% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 06 min at the start of May to 15 h 18 min by month's end. Set against the rest of the year, May is Ljubljana's 5th-clearest and 5th-windiest month. For the whole year in context, see Ljubljana's year-round climate.

Daytime high
19°
5th warmest
Overnight low
10°
8th coldest
Rainfall
103 mm
13.5 wet days
Daylight
14 h 42 min
4:36 AM – 7:21 PM
Cloud cover
60%
5th clearest
Wind
7 km/h
5th windiest
Solar energy
5.41 kWh/m²
Travel score
5.7
out of 10

Ljubljana is capital city of Slovenia.

Air quality
Elevated
PM2.5 16.2 µg/m³ · 2019
Density
1,662/km²
people per km²
Founded
1144

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 Ljubljana reaches about 19°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1188
2188
3188
4188
5189
6189
7189
8189
9199
10199
11199
12199
13199
141910
151910
161910
171910
182010
192010
202010
212010
222010
232011
242011
252111
262111
272111
282111
292111
302111
312112

How May really feels in Ljubljana

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Ljubljana weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°5984.98.90.0
Feb / -2°748.45.1100.4
Mar10° / 7610.13.311.62.5
Apr15° / 9012113.34.2
May19° / 10°10313.5014.75.7
Jun23° / 13°10513.4015.56.4
Jul25° / 15°9511.4015.26.8
Aug25° / 15°11211.10146.8
Sep20° / 11°12511.1012.36.1
Oct15° / 11710.20.510.74.4
Nov / 12111.22.39.21.7
Dec / -1°909.258.50.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 21% of May, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24555
34456
44555
54654
64555
74555
84654
94753
104753
114753
124852
134753
144753
154852
164852
174852
184951
194951
205050
215149
225149
235248
245149
255149
265248
275149
285149
295050
305149
315050

Chance of precipitation in May

Any precipitation

Ljubljana gets around 103 mm of rain over 13.5 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 44% and peaks near 45% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
143
244
344
445
545
645
745
845
945
1045
1145
1244
1344
1444
1543
1643
1743
1842
1942
2042
2141
2241
2342
2442
2542
2643
2743
2844
2944
3045
3145

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29910
39820
49820
59820
69730
79730
89730
99730
109730
119640
129640
139640
149640
159550
169460
179460
189370
199181
209091
2189101
2288111
2385132
2484142
2582162
2679183
2777203
2875223
2971254
3069274
3167294

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 06 min at the start of May to 15 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over May. Sunrise moves from 4:57 AM to 4:22 AM, and sunset from 7:01 PM to 7:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.14:577:01
214.14:557:03
314.24:547:04
414.24:527:05
514.34:517:07
614.34:497:08
714.44:487:09
814.44:467:11
914.44:457:12
1014.54:447:13
1114.54:427:14
1214.64:417:16
1314.64:407:17
1414.74:387:18
1514.74:377:19
1614.74:367:21
1714.84:357:22
1814.84:347:23
1914.94:327:24
2014.94:317:25
2114.94:307:26
2215.04:297:28
2315.04:287:29
2415.04:277:30
2515.14:267:31
2615.14:267:32
2715.14:257:33
2815.24:247:34
2915.24:237:35
3015.24:237:36
3115.34:227:37

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.41 kWh/m².

For context, solar energy here swings from a low near 1.03 kWh/m² to a high of 5.91 kWh/m² in July across the year — May's 5.41 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.4Bright
175.4Bright
185.4Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.6Bright
245.6Bright
255.6Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in May

Is May a good time to visit Ljubljana?

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

5.7
Sightseeing
5th-best month of the year
2.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Ljubljana for sightseeing.

What to pack for Ljubljana in May

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

In May, Ljubljana sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 14 days see rain.

rain gearsun protection

UV index in Ljubljana in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ljubljana peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr7High
May6High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Ljubljana 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 Ljubljana is worst in January — around 20 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Ljubljana's WHO annual average of 16.2 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJan 1920 µg/m³Sep 1513 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb18Moderate
Mar20Moderate
Apr19Moderate
May16Moderate
Jun17Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct14Moderate
Nov13Moderate
Dec16Moderate
Location & terrain

Where is Ljubljana?

Ljubljana sits at 46.1°N, 14.5°E, 295 m above sea level, in Slovenia. The nearest listed city is Kranj, 24 km away.

KranjPostojnaTrbovljeBledBohinjVelenjeDivačaNovo Mesto

Topography around Ljubljana

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

Within 3 km, the terrain around Ljubljana has only modest variations in elevation — a maximum elevation change of 165 m around an average of 309 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 847 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,759 m.

The land around Ljubljana is covered by artificial surfaces (55%) and trees (36%) within 3 km, trees (56%) and grassland (23%) within 16 km, and trees (77%) within 80 km.

3 km
165 m
16 km
847 m
80 km
2,759 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Kranj 24 km · Postojna 38 km · Trbovlje 44 km · Bled 46 km · Bohinj 49 km · Velenje 58 km · Divača 58 km · Novo Mesto 58 km

Slovenia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 63% of US
price level, 2025
GDP per capita
$37,376
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Catholic 69%atheist 14%Orthodox 4%non-believer/agnostic 4%

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 Ljubljana (46.0511°, 14.5051°, elevation 295 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. 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).