The variation in the geography of the Veneto region creates a microclimate. This microclimate reflects the weather of the greater Italian peninsula. Italy as a whole can be bitterly cold in its northernmost regions, sizzling on the coast, and foggy in the plains.

Use the weather profile Venice as a general guide when you visit Veneto. Travelers who expect to visit the entire Veneto region should regularly consult the weather reports. This is especially important during transitions across provinces.

Venice is at its outdoor best between April and June. The springtime days are clear and comfortably warm. Avoid the summer in most of Italy. It is hot and humid. Day time temperatures often are in the 90's.

Fall in Venice is almost as perfect as the spring. September is cooler than May and there are less crowds during the impending winter. The winter begins with heavy rain in November and frequent snowfalls thereafter. Holiday accommodations are scarce between Christmas and February (Carnavale).  

Padova and Treviso, which are very close to Venice, share similar weather patterns. Expect colder weather overall in Belluno since it is high in the mountains.
Plan for milder temperatures, but more rain and humidity farther inland (Rovigo, Vicenza and Verona).