Map from Google - Aegadian_Islands

The Aegadian Islands (Egadi in Italian) are located west of Sicily, a few miles from the coast, and are Favignana, Marettimo, Levanzo, plus some smaller islands. They are included in the protected sea area of the Aegadian Islands.
In the same area, and at an even shorter distance from Sicily, we find the Stagnone Islands, a group of islands located in a lagoon, on the coast near the airport of Trapani Birgi. The largest among them is called Isola Grande (Big Island), the second is Mozia, 700 metres (2,300 feet) from the coast.
Both in the Aegadian than in the Stagnone Islands the climate is Mediterranean: winter is mild and relatively rainy, with sunny periods, but also waves of bad weather, characterized by wind and rain, while summer is hot and sunny, a little sultry but tempered by the breeze.
Although temperatures are generally mild, the wind, which blows especially in the cold half of the year, can increase the feeling of cold; in particular the mistral and the west wind are frequent, but there can also be the south wind (scirocco) from Africa, which can bring the desert sand. Cold waves from the continent are rare, and in any event they not last long. Night temperatures never drop below freezing (0 °C or 32 °F), and snowfalls are extremely rare.
The only island that in the interior has elevations of some importance is Marettimo, where the highest peak, Monte Falcone, reaches 686 metres (2,250 feet).
For the data of these islands you can refer to the station of the nearby Trapani airport.
Average temperatures - Trapani
TrapaniJanFebMarAprMayJunJulAugSepOctNovDec
TrapaniJFMAMJJASOND
Min (°C)88810131720211916129
Max (°C)151517192327303028241916
Min (°F)464646505563687066615448
Max (°F)595963667381868682756661

Precipitations is not abundant, and follows the Mediterranean pattern, with a maximum in autumn and early winter, and a pronounced minimum in summer, when it almost never rains. In Trapani, 495 millimetres (19.5 inches) of rain per year fall.
Here is the average precipitation.
Average precipitation - Trapani
TrapaniJanFebMarAprMayJunJulAugSepOctNovDecYear
TrapaniJFMAMJJASONDY
Prec. (mm)655045402043945708070495
Prec. (in)2.621.81.60.80.20.10.41.82.83.12.819.5
Days98763111478964

The amount of sunshine in the Aegadian Islands is great in summer, when clear skies prevail; in winter, sunny periods, which however are not lacking, alternate with periods in which the sky is cloudy.

Favignana, Cala azzurra

The Aegadian coasts are generally formed by rocks overlooking the sea and caves, or by small bays, where you can sunbathe on a rocky shoreline. However, in the island of Favignana there also beaches.
The sea in the Aegadian Islands is warm enough for swimming from July to September, as generally happens in the Italian southern seas. In June, the sea is still a bit cool, while in October the water temperature is still decent (22 °C or 72 °F).
Here are the average sea temperatures.
Sea temperature - Aegadian
AegadianJanFebMarAprMayJunJulAugSepOctNovDec
AegadianJFMAMJJASOND
Sea (°C)151414151821252625221916
Sea (°F)595757596470777977726661

When to go

The best time to go to the Aegadian Islands, for a beach holiday, is the summer, from June to August. For swimming, the best time is from July to September, although in September, which overall is still a good month (especially in the first half), we begin to see the first disturbances. In June, as I said the sea is still a little cool, while in May it is still cold, and sometimes even the air can get a little too cool for sunbathing (perhaps because of the wind).

April and May are ideal for hiking, while in summer it can sometimes be too hot to stroll outdoors (especially in July and August: in June and September usually the heat is pleasant or at least bearable, obviously when the sirocco does not blow). In October, the temperatures are mild, but the days are shorter and the weather can be rainy and windy.

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