Megacities are often located along coasts and are greatly exposed to multiple climatic hazards. We take New York City as an example of a coastal megacity highly affected by heat waves, inland flooding and coastal flooding. These hazards overlap spatially or temporally in the city. We develop a multi-hazard risk map to identify hotspots of risk and prioritize adaptation strategies. We find that New York City should prioritize adaptation of coastal areas while considering synergies and trade-offs.