How to read Malta’s marine forecast: wind, waves & swell

The sunny icon has not inspected the landing

A marine forecast answers different questions from a city forecast. You may want to know whether the afternoon will feel warm enough for lunch outside; the boat operator needs to consider the route, the sea and the conditions at both ends. The same sunny symbol can appear above both questions without settling the second one.

Weather.mt shows wind alongside regional sea information so those parts can be read together. The useful habit is to begin with the time and place, then examine the wind and waves, rather than allowing the most cheerful icon on the page to chair the whole meeting.

The archive provides an immediate example. At Mosta, September 2024 averaged 25.1°C but included an hourly wind value of 14.1 m/s. Warmth and a lively wind forecast comfortably coexisted. That land point is not a measurement of a particular crossing; it is a reminder that temperature alone is a poor marine summary.

Start with the three-day sea forecast

The current marine page follows a 72-hour window from the current forecast hour. Three summary cards show the next 24 hours, 24–48 hours and 48–72 hours. Open each period for the underlying hourly values, including the hours of your return journey.

The wave range and highest wind use the available forecast samples in that window. The coverage count matters: a range based on twelve supplied wave values is not a complete twenty-four-hour record. Missing hours remain labelled as unavailable. Wind is shown for the selected land forecast point, while the waves come from a regional offshore point.

Open the current Malta three-day marine forecast

Marine forecast variables and limitations — Open-Meteo

Wind speed and Beaufort describe strength in different forms

Wind speed gives a numerical value in units such as metres per second or knots. Beaufort expresses wind strength as a force number. For example, 6.3 m/s is force 4, 10 m/s force 5 and 12 m/s force 6. Weather.mt displays the force beside speed in several forecast views.

The scale is useful for translating a number into a familiar category, but it does not turn wind into a complete description of sea conditions. Read the separate wave forecast rather than assigning a fixed wave height to a Beaufort number. The table below is a set of speed conversions, not a menu of conditions guaranteed at a bay.

Also distinguish a regular wind-speed figure from a gust. They are different measures. If a forecast separately supplies gusts, read that field on its own terms. The archived figures discussed in our monthly articles are the saved wind-speed values, so a peak in those articles should not be renamed a measured gust.

Beaufort scale reference — Met Office

Where the wind comes from changes the question

A northerly wind comes from the north; an easterly comes from the east. That sounds simple until an arrow is read as though every service uses it in the same way. On Weather.mt, the moving arrows show travel direction, while the accompanying direction description identifies where the wind comes from.

The relationship with a shore matters too. Wind blowing towards land is onshore; wind blowing from land towards the water is offshore. A sheltered-looking patch close to land is not a guarantee of the same shelter farther out. Offshore wind can be particularly troublesome for inflatables and other wind-affected craft.

Use direction as a prompt to inspect the actual coast and route. It can help explain why one side of an island looks different from another, but it is not an automatic safe-beach selector. Local advice, flags and the conditions in front of you remain relevant. A compass letter is useful information, not a permission slip.

How wind direction relates to the shore — Met Office

Comino and Blue Lagoon weather planning

What a wave-height number actually tells you

The usual significant wave height describes approximately the average height of the highest third of waves. It is a summary of a variable sea. It does not mean that every individual wave is the forecast height, or that a larger wave cannot appear.

If the page shows 1.2 m, read it as a wave statistic for that model point and hour. Do not mentally convert it into a ruler placed at the edge of a particular landing. The number is valuable, but its location and meaning need to travel with it.

That distinction helps explain why a calm-looking photograph can be a poor substitute for the forecast. A single image catches a moment from one angle. The forecast summarises a wider set of conditions at a particular point. Neither should be stretched into a promise about the height of the next wave reaching the rocks.

Significant wave height — US National Weather Service

The sea can remember wind from somewhere else

Locally generated wind waves and arriving swell can contribute to the sea at the same time. Swell has travelled out of its generating area, so local wind becoming lighter does not necessarily mean all wave motion disappears immediately. The sea is not obliged to restart whenever the breeze changes its mind.

Wave period, when provided, adds another piece of context: it describes the timing between waves. Different period measures exist, so keep the field’s label attached to its number. A combined wave forecast and a swell-specific forecast are also different parts of the description.

The practical outcome is to read the actual marine fields available for the route and hour rather than estimate them from land conditions. If a period or swell component is not supplied, an absent field is not evidence of zero swell. It is simply a reason to use the information the forecast does provide without filling the gap with a reassuring guess.

Wind waves and swell — NOAA glossary

A regional point is not a detailed map of every bay

Weather.mt’s marine information provides a regional view. Conditions at a bay, headland, landing or narrow passage can differ from the model point. The useful question is how that wider forecast relates to the specific place you plan to use, rather than whether the regional number can stand in for the place itself.

Wave growth also depends on more than the current wind speed: the time the wind has been blowing and its open-water reach matter. That helps explain why the same speed can accompany different sea states on different occasions. It is another reason to keep the wave forecast in the picture.

For a trip with an operator, use their current route and service advice. For your own vessel, weather is one part of a wider preparation process. Transport Malta’s checklist also points to relevant notices, the craft and its equipment. A forecast page is useful preparation, but it has not inspected the boat or the landing.

Wind, duration and fetch — US National Weather Service

Transport Malta’s boating preparation checklist

Read the journey, not just the departure hour

An outing has more than one important time. Start with departure, follow the likely hours on the water and inspect the return. A forecast that changes during the afternoon can matter even when the morning entry looks inviting. The same applies if the wind turns rather than simply strengthens.

Keep the timestamp and forecast date visible as you read. A screenshot passed around a group chat can outlive the conditions it was intended to describe. Open the current page again before making the final plan, and check any operator update relevant to the actual route.

This is also a useful way to use the islands map: move through the hours, read the selected point and compare the relevant layers. The animation gives a sense of development, while the figures carry the specific forecast information. Enjoy the moving arrows, but do not ask them to replace reading the numbers. They already have a full-time job being arrows.

A worked example: what each forecast field tells you

Imagine an illustrative forecast showing 6.3 m/s wind, a northerly origin and a 1.2 m significant wave height. You can identify the wind as Beaufort force 4 and understand the direction and wave statistic. Those facts do not, on their own, determine whether a particular activity or landing is suitable.

The next questions concern the actual place, the later hours, local conditions and the activity involved. A sheltered walk, a passenger crossing and a small wind-affected craft are not interchangeable plans. They deserve their own assessment rather than one general verdict borrowed from the air-temperature icon.

That is the useful way to read Malta’s marine forecast: combine the fields, keep their time and location attached, then use current local advice for the decision. The result is a much more informative picture of the day on the water, without having to turn a pleasant outing into an advanced examination in oceanography.

Wind directions and shoreline exposure, with a map

Compare shoreline exposure in the current wind