You can find this information on the meteorological section of the Aeronautica Militare (Military Air Force)
Military Air Force
You can find this information on the official Venice Municipality website or by calling the dedicated number +39 041-2411996. One can also call the Official Sea Water Weather Condition information number +39 041-2748787.
Official website of the city of Venice (Frequently Asked Questions):
Official website of the city of Venice (bulletin of the tide in Venice)