This is a pre-passage source and decision desk, not a current forecast or clearance to depart. The map is centred approximately on the area, not on your route or a forecast-zone boundary.
Sea-area bulletins and archipelago or fjord conditions have different scales. In season, check ice and sea-level products; in narrow passages also examine current and visibility, not only mean wind.
1. Primary sources
Open current bulletins and warnings for every sea area on the route. These links are starting points, not a promise that each covers the whole location; if unsure, identify the issuer through WMO–IMO.
2. Route and local effects
Use the correct national forecast and watch visibility, sea level and ice when relevant.
The Gulf of Finland spans Finnish, Estonian and other national waters; a single national coast forecast does not cover the whole crossing.
Compare FMI and the Estonian sea forecast for their sectors, with visibility, sea level and ice products when seasonally relevant.
How to use this source set
Start with the warning, then the marine text for the exact named area. If the route crosses a zone boundary, obtain both bulletins. Note issue and valid times, wind units and the meaning of wave height. Where a link opens an agency portal, navigate to its current marine product; a homepage is not itself a forecast.
Compare with an exposed station or buoy if available. Check its position and observation time: a sheltered station does not overturn a warning for an open channel. If a bulletin is missing or stale, identify the issuing service via WMO–IMO and defer the decision until current information is available.
Before-passage check
- Mark departure, exposed legs, arrival and feasible diversions; find the responsible named marine areas for each.
- Check warnings, issue and valid times; assess conditions when you expect to reach each leg, not only at departure.
- Compare wind and gusts, waves and swell, visibility, thunderstorms and local effects; do not infer a strait from a sheltered harbour.
- Compare recent observations where available, noting their time and exposure; a mismatch calls for another check.
- Set the next bulletin check, a reassessment trigger, an alternative and a backup communication channel.
Model map — optional
Windy is a third-party model display, not the issuer of official warnings. Choose a layer and check its valid hour and model run. Nothing loads until you click.
Without JavaScript, open the map separately.
If connectivity fails
Before departure, save the current official text bulletin and warning with issue time. Arrange another way to receive updates, such as an appropriate coastal broadcast, NAVTEX or satellite channel. A saved map cannot replace new warnings.
How to choose weather tools · All sailing areas
Scope: Source list assembled 25 September 2026; check its freshness and coverage before use. This public area guide is not a current personalised forecast, navigational notice service or safety verdict. Personalised forecasts with AI and experts are in closed testing; public booking is not open. The skipper makes the decision.
A Helsinki–Tallinn example needs both shores
Separate departure archipelago, open Gulf of Finland and the destination approach. Use the FMI product for the relevant Finnish waters and the Estonian marine text for the applicable gulf sector; their titles and valid periods need to be compared, not assumed identical. A clear departure harbour says little about fog, wave exposure or showers over the crossing. Keep marine warnings distinct from city-weather symbols on both shores.
- FMI marine-weather interpretation — Observations, marine forecast variables and buoy limitations, including winter removal. Direct product verification is limited; obtain the current issue from the issuer.
- Estonian marine text forecast — Named northern Baltic, gulf and Väinameri sectors; inspect actual validity. Direct product verification is limited; obtain the current issue from the issuer.
One Gulf, several water-level references
FMI and Estonian services provide marine observations and forecasts with labelled level references. The Estonian level model uses EH2000 and explicitly does not replace observations. Record reference, station and age before comparing with a chart; do not transfer a Finnish or Estonian centimetre value to the other coast by assumption. Wave and visibility measurements are also site-specific and do not certify every point on the ferry or yacht track.
- FMI marine-weather interpretation
- Estonian Environment Agency sea level — Model sea level and coastal observation distinction; EH2000 reference is explicitly stated.
Test arrival after a slower open-water leg
For the crossing, compare the original ETA with reduced progress and the time of any forecast wind or visibility change. Rebrief when the destination approach loses the expected shelter or the warning period extends into the crossing. Obtain current ice evidence when seasonally relevant; absent buoy data is not proof of ice-free conditions. Navigation and permission checks remain independent of whether the weather comparison improves.
- FMI marine-weather interpretation
- Estonian marine text forecast
- RYA passage planning — Practitioner guidance on contingency, tides, vessel and crew constraints.
Editorial review of this material: 27 September 2026. This date concerns the page content; check current forecast issue times and validity at the original sources.