Rauma tide times

Rauma is a coastal city on the southwestern Finnish Baltic shore, 90 km north of Turku, and the site of the largest preserved medieval wooden quarter in Scandinavia — Old Rauma (Vanha Rauma), a UNESCO World Heritage Site since 1991. The old quarter is a functioning neighbourhood of roughly 600 wooden buildings, the oldest surviving examples dating from the 18th century on medieval street foundations, and the whole district is still occupied: the wooden houses are homes, shops, cafés, and workshops rather than a preserved open-air museum. The building scale is domestic — two-storey timber-frame construction with steeply pitched roofs and small windows suitable for the coastal winter — and the overall character is one of the best examples in northern Europe of a mercantile wooden town that continued to develop without large-scale urban renewal.

The lace-making tradition at Rauma (Rauma-spets in Swedish) is UNESCO-listed as an Intangible Cultural Heritage: bobbin lace made in a distinctive local style developed here from the 17th century, originally produced by fishermen's wives during the winter months and exported to the Baltic trade. The Rauma Lace Week (Pitsiviikko) in late July brings lace-makers from across Europe for demonstrations, workshops, and sales. The Rauma Museum holds the most complete collection of the local lace tradition.

The Rauma archipelago stretches offshore for 30 km into the Bothnian Sea — the northern extension of the Baltic between Finland and Sweden — a world of granite skerries, guest harbours, and summer cottages accessible by private boat or by the public ferry service. The Outer Archipelago Marine Park (Saaristomeren kansallispuisto) extends from this coastline; the boat tour from Rauma harbour to Kuuskajaskari, a former coastal battery island with a guest harbour, is the standard day trip.

The Baltic tidal regime at Rauma is microtidal: mean astronomical range 0.1 to 0.2 m. As throughout the Finnish coast, wind-driven level changes and the long-term land uplift from post-glacial isostatic rebound dominate over the astronomical tide. The isostatic rebound at Rauma is approximately 4 to 5 mm per year — the land is rising faster than global sea level is rising, so the effective sea level at Rauma is actually falling on a century scale. This has a practical consequence: the outer islands and skerries are slowly emerging from the sea, former fishing camps on rocks that were awash a century ago are now dry platforms, and the navigable channels shift slowly as new obstructions appear.

Predictions on this page come from Open-Meteo Marine gridded model. At Rauma's 0.1 to 0.2 m astronomical range, the model's typical accuracy (plus or minus 45 minutes, 0.2 to 0.3 m) exceeds the total signal. The Finnish Meteorological Institute (FMI) operates the sea-level gauge at Rauma and publishes the authoritative tide tables and sea-level data for the southwestern Finnish coast.