What weather should I expect in Istanbul in late March, and what should I pack?

Late March conditions can change sharply: in one recent season, heavy snow in Istanbul led to the airport being closed for roughly two days.

Do not rely on a single spring forecast pattern: in another year, late-March daytime weather was warm enough for a T-shirt.

For a late-March Istanbul trip, pack adaptable layers: light clothing for a warm day plus a warm waterproof jacket for wind, rain, or a cold spell.