Municipality Acqua Alta Forecast
This page shows expected maximum and minimum tides over the next
few days. Normal high tide is 80 mm or less; anything over 90 mm
is considered acqua alta and will flood the Piazza San
Marco. Sirens are sounded when a tide of 110+ mm is expected. The
city's month-by-month tidal charts may help you decide whether you
need to be prepared for acqua alta during your visit.
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