Climate Insights for Castelvetrano

The climate in Castelvetrano is warm and mild. The average annual temperature is 19°C and approximately 541mm of precipitation falls per year. November is the wettest month, receiving around 105mm of rainfall. Castelvetrano is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, March, when temperatures can drop to 9°C.

Temperatures in Castelvetrano vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 9°C and an average of 12°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between May and June, with a 5°C shift in average temperatures.

Castelvetrano is a relatively dry area, receiving approximately 541mm of precipitation annually, which averages out to around 45mm per month. The wettest month is November, averaging 105mm of rainfall. January and March also tend to see above-average precipitation. The driest month is July, with just 2mm. That's 103mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Castelvetrano is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 14km/h in winter, 13km/h in spring, 11km/h in summer, 12km/h in autumn.

It is currently summer in Castelvetrano, which began on June 21, 2026. Castelvetrano is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 31°C, while the coldest stretch bottoms out in January near 9°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Castelvetrano is during April, May, June, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 38mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to 9°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Castelvetrano based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.