Castelvetrano weather in September

In September, Castelvetrano sees average daytime highs of 27°C and overnight lows near 20°C, with 43 mm of rain across 6.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 64% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Castelvetrano's 4th-clearest and 9th-windiest month. For the whole year in context, see Castelvetrano's year-round climate.

Daytime high
27°
4th warmest
Overnight low
20°
10th coldest
Rainfall
43 mm
6.4 wet days
Daylight
12 h 12 min
5:56 AM – 6:10 PM
Cloud cover
35%
4th clearest
Wind
11 km/h
9th windiest
Solar energy
5.18 kWh/m²
Travel score
7.3
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 September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 29°C in the first days to 25°C by the end.

A typical September day in Castelvetrano reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12922
22922
32922
42922
52921
62821
72821
82821
92821
102821
112821
122821
132721
142721
152720
162720
172720
182720
192720
202720
212620
222620
232620
242619
252619
262619
272619
282619
292519
302519

How September really feels in Castelvetrano

Once humidity and wind are folded in, September 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

September 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 September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 64% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38614
48614
58515
68416
78317
88317
98218
108119
118119
128020
137921
147921
157921
167723
177723
187624
197624
207525
217525
227525
237426
247327
257327
267327
277228
287228
297228
307228

Chance of precipitation in September

Any precipitation

Castelvetrano gets around 43 mm of rain over 6.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 21% and peaks near 25% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
111
212
313
414
515
616
717
818
919
1020
1121
1221
1322
1423
1523
1624
1724
1824
1925
2025
2125
2225
2325
2425
2525
2625
2725
2825
2925
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 39% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
139285010
2310285010
331029499
431029489
531130488
631131478
741131477
841132467
941233457
1041233456
1141234446
1241235436
1341235426
1441336416
1541337415
1641437405
1741437395
1851538385
1951638365
2051739355
2151739344
2261839334
2361940324
2462040304
2562140293
2662241283
2762341283
2872441272
2972441262
3072541252

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over September. Sunrise moves from 5:43 AM to 6:08 AM, and sunset from 6:34 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:436:34
212.85:446:33
312.85:456:31
412.75:466:29
512.75:466:28
612.65:476:26
712.65:486:25
812.65:496:23
912.55:506:22
1012.55:516:20
1112.45:526:18
1212.45:536:17
1312.45:536:15
1412.35:546:14
1512.35:556:12
1612.25:566:10
1712.25:576:09
1812.25:586:07
1912.15:596:05
2012.15:596:04
2112.06:006:02
2212.06:016:01
2311.96:025:59
2411.96:035:57
2511.96:045:56
2611.86:055:54
2711.86:065:53
2811.76:075:51
2911.76:085:49
3011.76:085:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.18 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 — September's 5.18 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
25.9Bright
35.9Bright
45.8Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Castelvetrano?

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

7.3
Sightseeing
4th-best month of the year
7.6
Beach & pool
4th-best month of the year

September 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 September

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

In September, Castelvetrano sees daytime highs around 27°C and nights near 20°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

Sea temperature near Castelvetrano in September

The nearest coast averages about 24°C in September — 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 September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 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
September 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).