How warm is the Baltic today?
Sea-water temperature for 53 cities on the Baltic coast, averaged live from up to seven independent meteorological and satellite sources — plus a 30-day history, a 10-day forecast, and the nearest beach to swim at.
What it does
53 cities, one map
Every major city and coastal town on the Baltic, from Copenhagen to Saint Petersburg, plotted on a live map with the current water temperature.
Seven sources, averaged
Satellite analyses, ocean models, and coastal stations are combined into one honest number — the app shows exactly how many sources agree.
30-day history
See how the water has warmed or cooled over the past month before deciding whether today is the day.
10-day forecast
An ocean-model prediction of where the temperature is headed, not just where it's been.
Nearby beaches
Curated beaches near each city, with photos, so you know exactly where to go once the water's warm enough.
Nine languages
Fully translated interface, no auto-translate guesswork — English, Russian, German, Polish, Lithuanian, Latvian, Finnish, Swedish, and Dutch.
Where the numbers come from
Every reading is fetched live and averaged only from whichever sources currently have data — nothing is estimated or invented.
- Open‑Meteo MarineOcean model based on Copernicus Marine / ECMWF data, plus the 10-day forecast
- NASA JPL MUR SSTMulti-satellite sea-surface-temperature analysis, 1 km grid
- NOAA OISST v2.1Optimum interpolation from satellites, ships and buoys, 25 km
- NOAA Geo‑Polar BlendedCoastWatch blended geostationary + polar satellite analysis, 5 km
- SMHISwedish Meteorological and Hydrological Institute, coastal observations
- FMIFinnish Meteorological Institute, mareograph stations
- IMGW‑PIBPolish Institute of Meteorology, coastal hydrological gauges
Free, honestly
No subscription, no ads, no paywalled features. Everything above is available the moment you open the app. If you'd like to support development, an optional tip jar in Settings offers six one-time amounts — purely a "thanks," with nothing to unlock.
$0.99 – $69.99 · optional · one-time · never required