SARONIC GULF · LIVE MODEL

Marine weather in Piraeus: wind, waves and sea temperature

Wind in knots and Beaufort, gusts, waves and water temperature at Piraeus for the next 48 hours, with a simple answer: is it a good time to go out?

NOW AND TODAY

The sea at Piraeus right now

Last updated: 12:30

Good at Piraeus (next 3 hours): Small boat — fine. SUP and kayak — fine. Swimming — with care. Shore fishing — fine. Wind 2 Bft (3 kn S), gusts 6 kn, waves 0.0 m

Wind: 1 kn · 2 km/h from S · 1 Beaufort
Gusts: 3 kn
Waves: 0.0 m · period 3 s
Air: 20 °C
Sea water: 22.8 °C

Best hours: today 12:00–18:00, tomorrow 08:00–18:00, tomorrow 08:00–13:00.

Tomorrow: Good: wind up to 9 kn from SSE (3 Beaufort), gusts up to 15 kn, waves up to 0.6 m, air 21…23 °C. Suitable daylight hours: 10 of 10.

As of 12:30 Greek time · source Open-Meteo · model forecast, not a measurement; not for navigation.

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NOW

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Wind (direction from)
Waves (direction from)

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Sea water—surface

Gusts—estimate

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ANGLER / SMALL BOAT

Should I go out?

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BEST HOURS · 48 H (DAYLIGHT)

How is the rating calculated?

	Wind	Gusts	Waves
Go	≤ 7 m/s (≈ 14 kn) up to 4 Beaufort	≤ 10 m/s (≈ 19 kn)	≤ 0,6 m
Caution	≤ 10 m/s (≈ 19 kn) 5 Beaufort	≤ 13 m/s (≈ 25 kn)	≤ 1,0 m
Not recommended	> 10 m/s 6+ Beaufort	> 13 m/s	> 1,0 m

Thresholds for a small boat (under 5 m, engine, experienced) — the same as in “⛵ My boat”; with a profile they adapt to you. The rating takes the worst of the next 3 hours. Outside daylight, thunderstorms or gusts above the limit → “Not recommended”; fog or missing wave data → at most “Caution”.

This is guidance, not an official warning. Before going out, check the HNMS (EMY) marine forecast, MeteoAlarm (Greece), the official warnings and any orders of the Hellenic Coast Guard. In an emergency: 112 or 108 (Coast Guard).

Forecast for heading out to sea

Place

Tomorrow…Loading forecast… …

Model forecast (Open-Meteo, MET Norway), not an official warning.

HOURLY · 48 H

Slide through time

Selected hour: —

MAP

Click on the sea for a forecast

The point is rounded to a 0.05° grid (~5 km). Waves come from the nearest sea cell of the model.

7 DAYS

The week ahead

Daily rating = the worst daylight hour (same scale as the hourly forecast).

SEA

Sea state

ATMOSPHERE

Air

SUN AND MOON

Daylight

BEACH

Swimming

Swim only on lifeguarded beaches and follow the lifeguards' flags. With waves above 1 m there is a risk of rip currents.

SCALES

Beaufort and Douglas — what the numbers mean

Wind · Beaufort

Sea · Douglas

DATA SOURCES AND LICENCES

Where the data comes from

Weather and sea (wind, gusts, temperature, rain, cloud, waves, swell, water temperature, currents): Open-Meteo forecast and marine APIs (models from national weather services, ECMWF and Copernicus Marine), licence CC BY 4.0. Changes: point and hour selection, unit conversion (knots, km/h, Beaufort), daily summaries.
Backup weather source: MET Norway Locationforecast 2.0, CC BY 4.0 — used only if Open-Meteo is unavailable.
Sun and moon: calculated in the browser with astronomical formulas — no external service.

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Aegean Radar is not affiliated with Open-Meteo, MET Norway, Copernicus, the Hellenic National Meteorological Service (HNMS/EMY) or the Hellenic Coast Guard, and they do not endorse this site. Forecasts come from models and can differ from real conditions, especially close to the coast.

SARONIC GULF

The sea at Piraeus: what to know

The forecast on this page is for a sea point off Piraeus (37.90° N, 23.60° E), in the Saronic Gulf. Values come from the Open-Meteo forecast and marine models (MET Norway as backup) and are updated several times a day.

More about the sea at Piraeus: wind, traffic, how to read the numbers

The Saronic Gulf is fairly sheltered, but the summer meltemi (north to north-east) funnels between Attica and Aegina, and southerly winds in winter push waves straight into the Piraeus and Faliro coast.

Piraeus is the busiest passenger port in Europe and a major container port: ferries leave every few minutes in summer and dozens of ships wait at anchor in the gulf. Keep clear of the port entrances and the anchorages and listen to VHF channel 16.

How to read the numbers: wind up to about 10 knots and waves under 0.5 m are usually comfortable for a small boat or SUP near the coast. Waves from 1 m and gusts above 22 knots are already serious for boats under 6 m. The rating follows the boat profile you choose.

Questions and answers

How big are the waves at Piraeus today?

The current significant wave height in metres and its period are in the “Now” block at the top, and hour by hour in the 48-hour chart. Values come from the Open-Meteo marine model.

What is the sea temperature at Piraeus?

We show the model sea-surface temperature at a point offshore. Close to the beach the water can differ by 1–2 °C, especially after a strong wind.

When is it dangerous to go out by boat at Piraeus?

With the default small-boat profile, gusts above 22 knots or waves above 1 m give “Not recommended”. Always check the official HNMS forecast, the official warnings and any sailing ban of the Coast Guard before going out.