San Lazzaro weather in May

In May, San Lazzaro sees average daytime highs of 24°C and overnight lows near 14°C, with 70 mm of rain across 9.4 wet days and about 14.6 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 26°C by the end. The sky is clear or mostly clear about 37% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 hours at the start of May to 15 h 06 min by month's end. Set against the rest of the year, May is San Lazzaro's 7th-clearest and 3rd-windiest month. For the whole year in context, see San Lazzaro's year-round climate.

Daytime high
24°
5th warmest
Overnight low
14°
8th coldest
Rainfall
70 mm
9.4 wet days
Daylight
14 h 36 min
4:53 AM – 7:28 PM
Cloud cover
52%
7th clearest
Wind
8 km/h
3rd windiest
Solar energy
6.04 kWh/m²
Travel score
7.0
out of 10

San Lazzaro is chief town of the homonym municipality.

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 22°C in the first days to 26°C by the end.

A typical May day in San Lazzaro reaches about 24°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 29°C. Set against its neighbours, May runs about 5°C warmer than April and about 5°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12112
22212
32212
42212
52212
62212
72213
82313
92313
102313
112313
122313
132313
142414
152414
162414
172414
182414
192414
202514
212514
222515
232515
242515
252515
262615
272615
282616
292616
302616
312616

How May really feels in San Lazzaro

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.

San Lazzaro weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 427.21.691.6
Feb10° / 617.71.710.12.6
Mar15° / 598.10.611.64.8
Apr19° / 7210.10.113.26.1
May24° / 14°709.4014.67.0
Jun29° / 18°588015.36.1
Jul31° / 20°497.10154.8
Aug31° / 20°557.9013.95.1
Sep26° / 16°668.1012.37.1
Oct20° / 12°728.9010.76.4
Nov14° / 83100.49.43.9
Dec / 638.51.28.71.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 45%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34951
44951
54951
64951
74951
85050
95050
105149
115149
125149
135248
145248
155347
165347
175545
185644
195743
205842
215941
226040
236040
246139
256139
266139
276238
286238
296139
306139
316139

Chance of precipitation in May

Any precipitation

San Lazzaro gets around 70 mm of rain over 9.4 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 31% and peaks near 36% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
536
635
735
834
934
1033
1132
1232
1331
1431
1530
1629
1729
1828
1928
2028
2127
2227
2327
2427
2527
2627
2727
2828
2928
3028
3128

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 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1851410
2831610
3811720
4801820
5791920
6782020
7772120
8772120
9762220
10762220
11752320
12752320
13742420
14742420
15742420
16722530
17722530
18712630
19712630
20712630
21692740
22682840
23672841
24652951
25633061
26623161
27603271
28593281
295633101
305434111
315135131

Wind in May

Winds average 8 km/h in May.

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

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

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

Days grow by about 66 minutes over May. Sunrise moves from 5:13 AM to 4:40 AM, and sunset from 7:10 PM to 7:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:137:10
214.05:117:12
314.15:107:13
414.15:087:14
514.15:077:15
614.25:057:17
714.25:047:18
814.35:037:19
914.35:017:20
1014.45:007:21
1114.44:597:23
1214.44:587:24
1314.54:567:25
1414.54:557:26
1514.64:547:27
1614.64:537:28
1714.64:527:29
1814.74:517:31
1914.74:507:32
2014.74:497:33
2114.84:487:34
2214.84:477:35
2314.84:467:36
2414.94:457:37
2514.94:447:38
2614.94:437:39
2715.04:437:40
2815.04:427:41
2915.04:417:42
3015.04:407:43
3115.14:407:44

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.04 kWh/m².

For context, solar energy here swings from a low near 1.27 kWh/m² to a high of 6.71 kWh/m² in July across the year — May's 6.04 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.7Bright
95.8Bright
105.8Bright
115.8Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Intense
176.1Intense
186.1Intense
196.1Intense
206.2Intense
216.2Intense
226.2Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in May

Is May a good time to visit San Lazzaro?

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

7.0
Sightseeing
2nd-best month of the year
5.7
Beach & pool
5th-best month of the year

May is one of the better times to visit San Lazzaro for general sightseeing.

What to pack for San Lazzaro in May

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

In May, San Lazzaro sees daytime highs around 24°C and nights near 14°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.

sun protectionlight clothesrain gear

UV index in San Lazzaro 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 San Lazzaro peaks around July 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 14UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar5Moderate
Apr7High
May6High
Jun8Very high
Jul9Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in San Lazzaro 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 San Lazzaro is worst in March — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1919 µg/m³Sep 1213 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar19Moderate
Apr18Moderate
May16Moderate
Jun16Moderate
Jul14Moderate
Aug14Moderate
Sep13Moderate
Oct15Moderate
Nov14Moderate
Dec16Moderate
Location & terrain

Where is San Lazzaro?

San Lazzaro sits at 44.5°N, 11.4°E, 66 m above sea level, in Italy. The nearest listed city is Bologna, 6.0 km away.

Topography around San Lazzaro

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

Within 3 km, the terrain around San Lazzaro has only modest variations in elevation — a maximum elevation change of 170 m around an average of 72 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 599 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,113 m.

The land around San Lazzaro is covered by trees (33%), artificial surfaces (30%) and cropland (25%) within 3 km, cropland (39%) and trees (31%) within 16 km, and cropland (38%) and trees (36%) within 80 km.

3 km
170 m
16 km
599 m
80 km
2,113 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Bologna 6.0 km · Casalecchio di Reno 11 km · Castel Maggiore 12 km · Zola Predosa 15 km · San Giovanni in Persiceto 26 km · Imola 27 km · Cento 31 km · Vignola 32 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%other 1%

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 San Lazzaro (44.4705°, 11.4085°, elevation 66 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).