The port of Catania is subject to ash falls produced by Mt Etna. Generally weak and wind driven. Strong currents have been reported at the harbor entrance. North-northeast current of about 2 kt will occur at the anchorage when a southward wind passes through the Strait of Messina. Tidal range is slight, about 1 ft.
Storm surge caused by strong easterly winds can flood inland.
Southeasterly winds can produce considerable swell in the inner harbor which is especially bad on the west side. Swell is bothersome but not dangerous. Accompanying winds can be dangerous. Swell generated by an easterly wind will normally diminish 24 hours after the wind stops. The small boat ride into the inner harbor from the anchorage takes about 30 minutes.