Cluj-Napoca weather in May

In May, Cluj-Napoca sees average daytime highs of 19°C and overnight lows near 8°C, with 89 mm of rain across 15.9 wet days and about 14.8 hours of daylight. It is the 5th-warmest and 3rd-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 25% 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 Cluj-Napoca's 7th-clearest and 3rd-windiest month. For the whole year in context, see Cluj-Napoca's year-round climate.

Daytime high
19°
5th warmest
Overnight low
8th coldest
Rainfall
89 mm
15.9 wet days
Daylight
14 h 48 min
4:57 AM – 7:46 PM
Cloud cover
62%
7th clearest
Wind
8 km/h
3rd windiest
Solar energy
5.45 kWh/m²
Travel score
5.3
out of 10

Cluj-Napoca is city and seat of Cluj County in northwestern Romania.

Air quality
Elevated
PM2.5 17.8 µg/m³ · 2017
Density
1,597/km²
people per km²
Founded
1213

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 Cluj-Napoca reaches about 19°C in the afternoon and slips back to 8°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 25°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1187
2187
3187
4187
5187
6187
7187
8187
9188
10198
11198
12198
13198
14198
15198
16198
17199
18199
19199
20199
21199
22209
23209
24209
252010
262010
272010
282010
292010
302010
312110

How May really feels in Cluj-Napoca

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.

Cluj-Napoca weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°3486.58.80.0
Feb / -5°359.25.8100.0
Mar / -1°49103.811.61.5
Apr14° / 6812.61.313.33.9
May19° / 8915.9014.85.3
Jun22° / 12°10716015.65.8
Jul24° / 13°10215.6015.36.2
Aug25° / 13°8412.40146.8
Sep20° / 7110.3012.46.2
Oct14° / 5690.610.64.3
Nov / 428.639.21.2
Dec / -4°438.85.68.40.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24753
34654
44654
54456
64357
74357
84357
94357
104159
114159
124258
134258
144258
154258
164357
174357
184357
194258
204258
214456
224456
234357
244357
254555
264654
274654
284555
294654
304753
314753

Chance of precipitation in May

Any precipitation

Cluj-Napoca gets around 89 mm of rain over 15.9 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 51% and peaks near 54% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
144
244
345
445
545
646
747
848
948
1049
1150
1250
1351
1451
1551
1652
1752
1852
1953
2053
2153
2253
2354
2454
2554
2654
2754
2854
2954
3054
3154

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 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79910
89820
99820
109820
119730
129730
139730
149640
159550
169550
179460
189370
199280
209190
2190100
2289110
2388120
2487130
2586140
2684160
2783170
2882180
2980200
3078211
3176231

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
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 5:19 AM to 4:43 AM, and sunset from 7:27 PM to 8:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.15:197:27
214.25:177:28
314.25:167:29
414.35:147:31
514.35:137:32
614.45:117:33
714.45:107:35
814.55:087:36
914.55:077:37
1014.65:057:39
1114.65:047:40
1214.65:027:41
1314.75:017:43
1414.75:007:44
1514.84:597:45
1614.84:577:46
1714.94:567:48
1814.94:557:49
1914.94:547:50
2015.04:537:51
2115.04:527:52
2215.14:517:54
2315.14:507:55
2415.14:497:56
2515.24:487:57
2615.24:477:58
2715.24:467:59
2815.34:458:00
2915.34:448:01
3015.34:448:02
3115.34:438:03

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.45 kWh/m².

For context, solar energy here swings from a low near 1.12 kWh/m² to a high of 5.8 kWh/m² in June across the year — May's 5.45 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.6Bright
305.6Bright
315.6Bright
Planning a trip in May

Is May a good time to visit Cluj-Napoca?

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

5.3
Sightseeing
5th-best month of the year
2.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Cluj-Napoca for sightseeing.

What to pack for Cluj-Napoca in May

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

In May, Cluj-Napoca sees daytime highs around 19°C and nights near 8°C. Pack rain gear. Worth having: sun protection. About 16 days see rain.

rain gearsun protection

UV index in Cluj-Napoca 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 Cluj-Napoca peaks around July 15 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowJul 15UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr7High
May6High
Jun8Very high
Jul8Very high
Aug8Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Cluj-Napoca 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 Cluj-Napoca is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Cluj-Napoca's WHO annual average of 17.8 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1624 µg/m³Dec 1511 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar22Moderate
Apr24Moderate
May22Moderate
Jun22Moderate
Jul21Moderate
Aug19Moderate
Sep15Moderate
Oct12Moderate
Nov13Moderate
Dec11Good
Location & terrain

Where is Cluj-Napoca?

Cluj-Napoca sits at 46.8°N, 23.6°E, 352 m above sea level, in Romania. The nearest listed city is Turda, 26 km away.

Ocna MureşDejLuduşAiudZalău

Topography around Cluj-Napoca

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

Within 3 km, the terrain around Cluj-Napoca has only modest variations in elevation — a maximum elevation change of 202 m around an average of 375 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 546 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,669 m.

The land around Cluj-Napoca is covered by artificial surfaces (61%) and trees (24%) within 3 km, grassland (45%), trees (25%) and cropland (21%) within 16 km, and trees (43%), grassland (35%) and cropland (20%) within 80 km.

3 km
202 m
16 km
546 m
80 km
1,669 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Turda 26 km · Câmpia Turzii 32 km · Gherla 38 km · Ocna Mureş 47 km · Dej 47 km · Luduş 50 km · Aiud 52 km · Zalău 64 km

Romania travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 44% of US
price level, 2025
GDP per capita
$22,538
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
82%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
10.3
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 605
Religion
Romanian Orthodox 85%other 5%Roman Catholic 5%Reformed 3%

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 Cluj-Napoca (46.7667°, 23.6°, elevation 352 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).