Sicily is the largest island in the Mediterranean and a place that rewards more than one visit. Greek temples, Norman cathedrals, baroque hill towns, smoking volcanoes, and a coastline that mixes black-sand beaches with bleached limestone coves — all packed into an island bigger than Belgium. The climate is classic Mediterranean stretched into something even longer thanks to its southern latitude: a six-month beach season and a long, mild shoulder.
May, June, September and October are the connoisseur months — warm but not punishing, full sun, and the great archaeological sites walkable without dehydration. July and August are very hot but cheaper and the sea is at its warmest.
Mild rather than cold: highs of 14-16°C and rain spread across eight to ten days a month. Mount Etna is reliably snow-capped; you can sometimes ski Etna in the morning and have lunch on the coast. Most coastal resorts are closed but the cities (Palermo, Catania, Syracuse) stay vibrant.
April brings the wildflower season and ideal walking weather at 20-22°C. May warms steadily into the mid-twenties and the sea climbs past 18°C — beach days begin in earnest in late May for the brave.
June through August is dry, hot and very sunny: highs of 30-33°C, regular 35-37°C heatwaves, and sea temperatures of 24-26°C. The interior can hit 40°C; the coasts stay slightly cooler thanks to sea breezes. Crowds peak in mid-August (Italian Ferragosto holiday).
September is exceptional: sea still 25°C, air softening to 27°C, and crowds gone after the first week. October is excellent for ruins and food; the wine harvest peaks. By November the autumn rains begin.
Sicily for ruins, food, baroque architecture and culture; Sardinia for beaches, mountains and wilderness. Sicily has more cities and historical depth; Sardinia has clearer water and emptier coves.
Ten days for a meaningful loop (Palermo, Agrigento, Syracuse, Taormina, Etna). Two weeks lets you add the Aeolians or slow down.
Generally yes — it is constantly monitored and tour operators stop ascents during eruption activity. Recent eruptions have closed the upper craters at times but not affected the surrounding tourist areas.
Increasingly, yes. July and August now regularly see heatwaves above 38°C. Most travellers shift to early-morning sightseeing and afternoon beach time.