Sandhamn tide times

Sandhamn sits on the island of Sandön at the outermost edge of the Stockholm Archipelago, roughly 50 km east of Stockholm by water. It is one of Sweden's most storied sailing destinations — the KSSS (Kungliga Svenska Sällskapet Segel) has used Sandhamn as the finish of the annual Round Gotland Race since the race's founding in 1937. The 550 km offshore race from Stockholm around the island of Gotland draws 300–500 boats and finishes in the narrow channel between Sandön and Telegrafholmen, where the KSSS clubhouse and regatta dock sit. The finish is timed by race officials, not by tide: in the Baltic there is no tidal window to hit.

Astronomical tidal range at Sandhamn is approximately 0.2 m — slightly larger than inner Stockholm but still functionally negligible. Sea level here is driven by the same meteorological forces as everywhere on the Baltic: wind setup, barometric pressure, and the ~27-hour Baltic seiche. But at Sandhamn, which is exposed to the full fetch of the northern Baltic proper, the range of wind-driven sea level variation is wider than at inner archipelago locations. A northeast gale can drain water from the outer archipelago, dropping sea level 0.3–0.4 m below normal and grounding boats on unmarked rocks; a strong southwesterly does the opposite. Experienced sailors rounding Gotland en route to the Sandhamn finish always check the SMHI water level forecast for the outer archipelago before threading the shallow approaches.

Sandön's harbour (gästhamn) is operated by KSSS and serves approximately 150 guest berths in summer, expanding to over 300 during the Round Gotland Race week (late July/early August). The harbour approaches from the south require navigating the Sandhamnsleden, a buoyed fairway through skerries with depths of 3.5–6.0 m in the marked channel and as little as 0.5 m on the flanking shoals. With Baltic sea level variation of up to ±0.4 m driven by weather, a boat drawing 2.0 m in a 2.5 m channel has limited margin when a low-pressure system has depressed sea level by 0.2 m.

Beyond racing, Sandhamn is a hiking and swimming island. The interior is forested with Scots pine over granite. The eastern coast faces open water and has several sandy beaches — Trouville is the main bathing beach, sheltered from the west by low dunes. Water temperature in the outer archipelago reaches 18–20 °C in July–August at the surface; below the thermocline (which forms at 5–10 m depth in summer) temperatures drop sharply to 4–6 °C. The ferry from Stockholm (Strömkajen or Stavsnäs) runs year-round; summer frequency is typically 4–5 departures daily, with journey time of 2.5–3.5 hours depending on route. In winter Sandhamn's permanent population is around 100 people; in summer the island hosts several thousand visitors.

Sea kayakers paddling the outer archipelago use Sandhamn as a base or waypoint. The island is exposed to swell from the northeast and southeast; wind forecasts and SMHI sea state warnings matter more than water level for passage planning at this location. The outer skerries east of Sandön — the Revengegrundet area — are awash at mean sea level and require attention to the SMHI sea level forecast before kayaking through.

TideTurtle displays Open-Meteo Marine sea level data for Sandhamn. Astronomical range is approximately 0.2 m; meteorological sea level variation can reach ±0.4 m in the outer archipelago. Open-Meteo Marine accuracy is typically ±45 minutes on timing and ±0.2–0.3 m on height. SMHI is the authoritative source for outer archipelago sea level information at smhi.se.