Castelvetrano weather in May

In May, Castelvetrano sees average daytime highs of 23°C and overnight lows near 16°C, with 22 mm of rain across 4.7 wet days and about 14 hours of daylight. It is the 6th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 25°C by the end. The sky is clear or mostly clear about 62% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of May to 14 h 24 min by month's end. Set against the rest of the year, May is Castelvetrano's 5th-clearest and 7th-windiest month. For the whole year in context, see Castelvetrano's year-round climate.

Daytime high
23°
6th warmest
Overnight low
16°
7th coldest
Rainfall
22 mm
4.7 wet days
Daylight
14 hours
5:04 AM – 7:06 PM
Cloud cover
35%
5th clearest
Wind
13 km/h
7th windiest
Solar energy
7 kWh/m²
Travel score
8.1
out of 10

Castelvetrano 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 21°C in the first days to 25°C by the end.

A typical May day in Castelvetrano reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, May runs about 4°C warmer than April and about 5°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12114
22114
32114
42114
52114
62214
72215
82215
92215
102215
112215
122215
132315
142315
152315
162316
172316
182316
192316
202316
212416
222416
232416
242416
252417
262417
272417
282517
292517
302517
312517

How May really feels in Castelvetrano

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.

Castelvetrano weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 629.69.74.4
Feb14° / 619.510.54.4
Mar16° / 10°548.511.75.5
Apr19° / 12°467.812.96.6
May23° / 16°224.7148.1
Jun27° / 19°71.614.68.1
Jul30° / 22°30.614.36.8
Aug31° / 23°81.713.56.2
Sep27° / 20°436.412.37.3
Oct24° / 17°718.2117.4
Nov19° / 13°7310.3106.2
Dec16° / 10°6610.29.45.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27327
37327
47327
57426
67426
77426
87426
97525
107525
117525
127426
137525
147525
157525
167525
177624
187624
197723
207723
217723
227822
237822
247921
258020
268020
278119
288119
298119
308119
318119

Chance of precipitation in May

Any precipitation

Castelvetrano gets around 22 mm of rain over 4.7 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 16% and peaks near 22% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
122
222
321
421
520
620
719
818
918
1017
1117
1216
1316
1415
1515
1615
1715
1814
1914
2014
2114
2213
2313
2413
2513
2612
2712
2812
2911
3011
3110

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 58% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
178220
277230
375250
474260
573270
672280
771290
870300
969310
1067321
1166331
1265341
1365341
1463352
1562362
1660373
1759383
1857394
1955405
2053416
2151427
2249438
2347449
24454510
25444511
26424612
27404713
28384714
29374816
30354817
31334818

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 24 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 5:20 AM to 4:55 AM, and sunset from 6:52 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:206:52
213.65:196:53
313.65:186:54
413.65:166:55
513.75:156:56
613.75:146:57
713.75:136:58
813.85:126:59
913.85:117:00
1013.85:107:00
1113.95:097:01
1213.95:087:02
1313.95:077:03
1414.05:067:04
1514.05:057:05
1614.05:047:06
1714.15:047:07
1814.15:037:08
1914.15:027:08
2014.15:017:09
2114.25:007:10
2214.25:007:11
2314.24:597:12
2414.24:587:13
2514.34:587:13
2614.34:577:14
2714.34:577:15
2814.34:567:16
2914.34:567:16
3014.44:557:17
3114.44:557:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 7 kWh/m².

For context, solar energy here swings from a low near 2.13 kWh/m² to a high of 7.62 kWh/m² in June across the year — May's 7 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.7Intense
46.7Intense
56.7Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.9Intense
116.9Intense
126.9Intense
137.0Intense
147.0Intense
157.0Intense
167.0Intense
177.0Intense
187.0Intense
197.1Intense
207.1Intense
217.1Intense
227.1Intense
237.1Intense
247.2Intense
257.2Intense
267.2Intense
277.2Intense
287.2Intense
297.3Intense
307.3Intense
317.3Intense
Planning a trip in May

Is May a good time to visit Castelvetrano?

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

8.1
Sightseeing
1st-best month of the year
6.1
Beach & pool
5th-best month of the year

May is one of the better times to visit Castelvetrano for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Castelvetrano in May

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

In May, Castelvetrano sees daytime highs around 23°C and nights near 16°C. Pack sun protection. Worth having: light clothes. About 5 days see rain.

sun protectionlight clothes

Sea temperature near Castelvetrano in May

The nearest coast averages about 18°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 16 km away) is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 9 to Nov 5 — about 4.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb15Bracing
Mar15Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep24Refreshing
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Castelvetrano in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castelvetrano peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateVery highHighModerateJul 16UV 10Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb4Moderate
Mar6High
Apr4Moderate
May5High
Jun9Very high
Jul10Extreme
Aug8Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low
Location & terrain

Where is Castelvetrano?

Castelvetrano sits at 37.7°N, 12.8°E, 187 m above sea level, in Italy. The nearest listed city is Mazara del Vallo, 18 km away.

Topography around Castelvetrano

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

Within 3 km, the terrain around Castelvetrano has only modest variations in elevation — a maximum elevation change of 166 m around an average of 164 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 583 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,576 m.

The land around Castelvetrano is covered by grassland (46%) and trees (21%) within 3 km, grassland (52%) and cropland (21%) within 16 km, and water (56%) and grassland (24%) within 80 km.

3 km
166 m
16 km
583 m
80 km
1,576 m
treesshrubsgrasslandcroplandartificial surfaceswater
May weather nearby: Mazara del Vallo 18 km · Sciacca 32 km · Marsala 34 km · Alcamo 36 km · Trapani 44 km · Casa Santa 44 km · Ribera 47 km · Partinico 50 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 Castelvetrano (37.6808°, 12.7919°, elevation 187 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).