Kärdla, Hiiumaa tide times

Hiiumaa is Estonia's second-largest island, quieter and more forested than Saaremaa to its south, separated from the mainland by the Väinameri — the shallow shelf sea that fills the space between the West Estonian islands and the continental shore. The island has roughly 9,000 permanent residents and a summer population that roughly doubles with Estonian holiday-makers. Kärdla, the main town of 3,000 people, sits on the northern coast of the island in a sheltered bay that was historically significant as a small industrial harbour.

The Kõpu Peninsula lighthouse, on the westernmost projection of Hiiumaa, is the island's defining landmark and one of the most historically significant lighthouses in the world. Built in 1531 on the orders of the Livonian Order to warn ships navigating the approaches to the Gulf of Riga, the Kõpu lighthouse (Kõpu tuletorn) has been in continuous operation for nearly 500 years — a claim shared by only a handful of lighthouses globally. The original structure was a stone tower lit by wood fires; it was progressively improved and remains operational with a modern lamp visible 35 km out to sea. The tower is open for climbing in summer; the forest around the lighthouse base is the densest and most mature on the island, growing on the old dune systems that underlie the peninsula.

The Tahkuna Peninsula at the island's northernmost tip is a counterpoint to the lighthouse: exposed to the open Baltic from the northwest, the shore here is rocky and wave-worked limestone, and the war memorial at the tip — a bell monument to the children who died in the 1994 Estonia ferry disaster — is a place of pilgrimage for Estonian families. The Estonia sank in a storm 22 km northwest of Tahkuna in September 1994 with 852 fatalities; the bell rings in the wind above the shore facing the site.

Hiiumaa's cycling culture is real and established. The island is flat enough for comfortable long-distance cycling and the road network is quiet; the 163 km perimeter route is a standard summer activity. Bicycle rental is available in Kärdla and at the ferry terminal at Heltermaa. Summer wooden villas from the late 19th and early 20th centuries are scattered through the island's villages — the remnant of a Finnish-Swedish cultural presence that predates Soviet occupation.

The Baltic tidal regime at Hiiumaa is microtidal: mean astronomical range 0.1 to 0.3 m. Wind-driven water-level changes dominate the tidal signal throughout the West Estonian islands. The Väinameri to Hiiumaa's east is particularly shallow — depths rarely exceed 5 m — and responds sensitively to wind forcing, with level changes of 0.5 to 1.0 m in major weather events. The open northwest coast of the island sees higher wave energy from westerly Baltic storm fetch. Predictions on this page come from Open-Meteo Marine gridded model. The Estonian Maritime Administration and Keskkonnaamet publish the authoritative sea-level data for this region.