Castelvetrano in Summer
In summer (June, July and August), Castelvetrano sees average daytime highs around 29°C and overnight lows near 21°C, with 17 mm of rain over about 4 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 25°C in early June to 30°C by late August. The sky is clear or mostly clear about 88% of the time across summer, and the air most often feels humid.
Summer is Castelvetrano's best season of the year to visit on our travel score. For the whole year in context, see Castelvetrano's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 17 mm
- 4 wet days
- Avg wind
- 11 km/h
- Travel score
- 7.0
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Castelvetrano in Summer
Over the season highs climb from about 25°C in early June to 30°C by late August.
A typical summer day in Castelvetrano reaches about 29°C and drops to 21°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Castelvetrano
Once humidity and wind are folded in, summer brings about 16 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Castelvetrano weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 14° / 9° | 62 | 9.6 | 9.7 | 4.4 |
| Feb | 14° / 9° | 61 | 9.5 | 10.5 | 4.4 |
| Mar | 16° / 10° | 54 | 8.5 | 11.7 | 5.5 |
| Apr | 19° / 12° | 46 | 7.8 | 12.9 | 6.6 |
| May | 23° / 16° | 22 | 4.7 | 14 | 8.1 |
| Jun | 27° / 19° | 7 | 1.6 | 14.6 | 8.1 |
| Jul | 30° / 22° | 3 | 0.6 | 14.3 | 6.8 |
| Aug | 31° / 23° | 8 | 1.7 | 13.5 | 6.2 |
| Sep | 27° / 20° | 43 | 6.4 | 12.3 | 7.3 |
| Oct | 24° / 17° | 71 | 8.2 | 11 | 7.4 |
| Nov | 19° / 13° | 73 | 10.3 | 10 | 6.2 |
| Dec | 16° / 10° | 66 | 10.2 | 9.4 | 5.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 88% of the time across summer.
Chance of precipitation in Summer
Castelvetrano gets around 17 mm of rain over 4 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.3 kWh/m².
Is summer a good time to visit Castelvetrano?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer 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 Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Castelvetrano sees daytime highs around 29°C and nights near 21°C. Pack light clothes and sun protection.
Sea temperature near Castelvetrano in Summer
The nearest coast averages about 23°C across summer — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 15 | 15 | 15 | 18 | 21 | 24 | 25 | 24 | 22 | 19 | 16 |
| Comfort | Cool | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Warm | Refreshing | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Cool |
| Feb | 15 | Bracing |
| Mar | 15 | Bracing |
| Apr | 15 | Cool |
| May | 18 | Cool |
| Jun | 21 | Refreshing |
| Jul | 24 | Refreshing |
| Aug | 25 | Warm |
| Sep | 24 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 16 | Cool |
UV index in Castelvetrano in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 6 | 4 | 5 | 9 | 10 | 8 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | High | Moderate | High | Very high | Extreme | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 4 | Moderate |
| Mar | 6 | High |
| Apr | 4 | Moderate |
| May | 5 | High |
| Jun | 9 | Very high |
| Jul | 10 | Extreme |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
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.
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
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.