Map from Google - Aeolian_Islands

The Aeolian Islands have a Mediterranean climate: winter is mild and relatively rainy, with sunny periods, but also periods of bad weather, characterized by wind and rain, while summer is hot and sunny, a bit sultry but tempered by the breeze. In spring, in April and May, sometimes in the morning fog can form. Although temperatures are generally mild, the wind, which blows especially in the cold half of the year, can increase the feeling of cold.

Lipari Castle

The Aeolian archipelago is located north-east of Sicily, and includes the islands of Lipari, Salina, Vulcano, Stromboli, Filicudi, Alicudi and Panarea. These are volcanic islands, therefore there are some elevations in the interior: in particular, Lipari reaches 602 metres (1,975 feet) above sea level, Salina 962 metres (3,156 feet, in Mount Fossa delle Felci), Volcano 499 metres (1,637 feet), Stromboli 926 metres (3,038 ft, in the volcano of the same name), Filicudi 773 metres (2,536 feet), Alicudi 675 metres (2,214 feet), and Panarea 420 metres (1,378 ft).
On the slopes of these hills, we can find small forests.
In the plain, snowfalls are extremely rare, and the minimum temperature does not reach 0 °C (32 °F) even during cold spells, while snowfalls are a bit more frequent at hill altitudes.
The highest temperature records, which occur when the Sirocco blows from Africa, are around 38/39 °C (100/102 °F), from June to August.
Here for example, the average temperatures of Salina.
Average temperatures - Salina
SalinaJanFebMarAprMayJunJulAugSepOctNovDec
SalinaJFMAMJJASOND
Min (°C)111112141720242421191511
Max (°C)151517192226293027242016
Min (°F)525254576368757570665952
Max (°F)595963667279848681756861

The rain pattern in the Aeolian islands is Mediterranean, with a maximum in autumn and winter, when even thunderstorms are fairly frequent, a drop in spring, when there is already little rain, and a minimum in summer, when it rains very rarely.
Since we don't have any data on the rainfall of the Aeolian Islands, we refer to the average rainfall in Ustica.
Average precipitation - Ustica
UsticaJanFebMarAprMayJunJulAugSepOctNovDecYear
UsticaJFMAMJJASONDY
Prec. (mm)50503540201052055757565505
Prec. (in)221.41.60.80.40.20.82.2332.619.9
Days98753111479965

The amount of sunshine in the Aeolian 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.

The sea viewed from Panarea, with Stromboli and Basiluzzo in the background

The sea in the Aeolian Islands is warm enough for swimming from July to September. In June, the sea is still a bit cool (only 21 °C or 70 °F), while in October, after the summer, its temperature is still decent (22 °C or 72 °F).
Here are the average sea temperatures.
Sea temperature - Aeolian Islands
Aeolian IslandsJanFebMarAprMayJunJulAugSepOctNovDec
Aeolian IslandsJFMAMJJASOND
Sea (°C)151414151821252625221916
Sea (°F)595757596470777977726661

When to go

The best time to go to the Aeolian Islands, for a beach holiday, is the summer, from June to August. For swimming, the best time is from July to September, but in September, which overall is still a good month (especially in the first half), the first weather disturbances being to pass. In June, as mentioned the sea is still a little cool, while in May it is even 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 hot to move outdoors (especially in July and August: in June and September usually the temperature is enjoyable or at least tolerable, except when the wind blows from Africa). In October, the temperatures are mild, but the days are shorter and the weather can be rainy and windy.

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