Situated in North-East Italy, the weather in Venice changes through out the year. The hottest month is July and coldest month is January. Over the fall and winter months Venice can suffer from flooding, that in November seems to occur almost on a daily basis. This is known as Acqua Alta.

Acqua Alta is a phenomenon that regularly arises in the city of Venice, most commonly during autumn and spring high tides. It involves the flooding of the lowest lying areas of Venice, or, in more severe cases, up to 96% of the City streets. By official definition, acqua alta occurs when water is higher than 90 cm. (35.4 inches) above normal sea level.

When a higher than usual tide is anticipated in the city, sirens are sounded 3-4 hours in advance to warn the public, but they only start if the level is expected to be above 110 cm. (12% of the surface under water).

Venice weather in spring (march � may)

Spring is one of the most beautiful seasons to visit Venice. Mass tourism has not really started yet and the temperatures are usually very comfortable.

The weather of spring is usually sunny but also there are some chances of rain and thunderstorm. The days are starting to lengthen, and in fact during the month of May one can expect about 10 hours of daylight. The average temperatures for this season are between 12�C and 21�C (53�F and 70�F).
Venice weather in summer (june � august)

Summer weather in Venice is radiant, hot and humid. The average summer temperature varies among 25�C and 31�C (80�F and 90�F), sometimes, overall in last years reaching the 40�C (104�F) mark, but the evenings are often quite comfortable, except for cases of Sirocco.
Venice weather in fall (september � november)

The Venice weather in autumn is usually lovely and offers spectacular sunsets. The daylight hours are only about 8 to 9 hours a day. Early autumn is normally fairly dry; the wetter season starts around mid-November. The average temperature is 15�C (59�F).
Venice weather in winter (december � february)

Normally the winter weather in Venice is sunny and cold. There are not many hours of daylight in December, but by February the days have extended considerably. This season is sometimes wet due to the probability of fog, Sirocco or rain. Sometimes snowfalls happen in winter. The average winter temperature is around 8�C (47�F).