Ustica, where it's located

Ustica, an island located about 65 kilometers (40 miles) north of Palermo, Sicily, has a Mediterranean climate: winters are mild and relatively rainy, with sunny periods, but also waves of bad weather, characterized by wind and rain, while summers are hot and sunny, a bit stuffy, but tempered by the breeze. In spring, in April and May, fog can sometimes form in the morning. Although the temperature is generally mild, the wind, which blows especially in the cold half of the year, can increase the sensation of cold.
The island is accessible by boat from Naples and Palermo. In inland areas, there are hills, and on the highest point, 250 meters (820 feet) above sea level, lies the weather station: here, the daily average temperature ranges from 11 °C (52 °F) in January and February to 25.5 °C (78 °F) in August. At sea level, you can expect a temperature about 1 degree Celsius (1.8 degrees Fahrenheit) higher.
Snow is very rare, and only occurs in the coldest periods. The lowest recorded temperatures are around 0 °C (32 °F) in January, February and March, while the highest, which occur when the Sirocco blows from Africa, are around 38/39 °C (100/102 °F), and are recorded from June to August.
Here are the average temperatures.
Ustica - Average temperatures
Min (°C)9910111518212220171311
Max (°C)131314162125282926221715
Min (°F)484850525964707268635552
Max (°F)555557617077828479726359

In Ustica, 505 millimeters (20 inches) of rain fall per year, with a maximum in autumn (in October and November) and a minimum in summer, when it hardly ever rains. As you can see in the following table, there is little rain already in May. Here is the average precipitation.
Ustica - Average precipitation

The amount of sunshine in Ustica is excellent in summer, when clear skies prevail; in winter, sunny periods, which can occur in this season as well, alternate with cloudy periods. Here are the average sunshine hours per day.
Ustica - Sunshine

Ustica from above

There are not many beaches in Ustica, since the island is of volcanic origin: the coast is generally formed by cliffs overlooking the sea, or by small bays where you can sunbathe, like the famous Cala Sidoti. Thanks to the Marine Protected Area, on the north-west coast, it is possible to swim (and dive) in waters where it is forbidden for any kind of boat to pass.
The sea in Ustica is warm enough for swimming from July to September. In June, the sea is still a bit cool. Here are the average sea temperatures.
Ustica - Sea temperature
Temp (°C)151414151821252625221916
Temp (°F)595757596470777977726661

Best Time

The best time to go to Ustica for a beach holiday is the summer, from June to August. The water temperature is comfortable enough from July to September, but in September, which overall is still a good month (especially in the first half), the first weather disturbances begin to occur. In June, as mentioned, the sea is still a little cool, while in May, it is still cold, and the air can sometimes be a little too cool for sunbathing as well (perhaps because of the wind).

April and May are advisable months for hiking, perhaps in the prehistoric village, while in summer, it can sometimes be too hot to get around (especially in July and August: in June and September, the temperature is usually enjoyable or at least tolerable). In October, the temperatures are mild, but the days are shorter and the weather can be rainy and windy.

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