Beirut has a hot-summer Mediterranean climate (Köppen: Csa) characterised by mild days and nights, as its coastal location allows temperatures to be moderated by the sea. Autumn and spring are warm, but short. Winter is mild and rainy. Summer is prolonged, hot and muggy. The prevailing wind during the afternoon and evening is from the west (onshore, blowing in from the Mediterranean); at night it reverses to offshore, blowing from the land out to sea.