The Cyclades islands (of which Milos is one) have a typically Mediterranean climate with hot, dry summers and mild winters. In July and August the mercury can soar to over 100°F in the shade just about anywhere in the country, although the average daytime high on Milos in these months is a very beach-friendly 82-86°F, and evenings are a balmy 72°F, perfect for alfresco wining and dining.
As well as being the hottest months, July and August are the peak time of the meltemi, a strong northerly wind that sweeps the eastern coast of mainland Greece and the Aegean islands, especially the Cyclades. The wind is a mixed blessing: it reduces humidity, but can play havoc with ferry schedules and sends everything flying - from beach umbrellas to washing hanging out to dry.
Any summer rainfall will come as a surprise - Milos is almost bone dry from June to September. November is when the rains start, and the weather stays cool and wet until March - although there are also occasional winter days with clear blue skies and sunshine, with December and January daytime averages hovering around 55°F. This is when the locals have the islands to themselves - Milos, as with many other islands, goes into tourist hibernation between November and April. Easter is when Greece starts repainting and rolling up the shutters, gearing up for the summer ahead.
Milos has a small airport and one or two daily flights to/from Athens (40min), operated by Olympic Airlines. The airline's office is in Adamas, just past the main square, on the road to Plaka.
From the attractive main port of Adamas there are two ferries daily to Piraeus (5hr to 7hr); one daily to Sifnos (1.25hr), Serifos (2hr) and Kythnos (3.5hr); and six weekly to Kimolos (1hr). There are much more frequent connections with neighboring Kimolos from the north-coast village of Pollonia - there are ferry connections between Pollonia and Psathi on Kimolos five times daily (20min).
Cars, motorcycles and mopeds can be hired along the waterfront. A boat trip around the island (these depart from the Adamas waterfront from May to September) allows you to visit most of Milos' beaches (many inaccessible by road), coves and geologically interesting places (strange rock formations, hot springs etc).