April and May
Go nowMild, long days, before the summer peak
The best window: warm enough to sit outside, cool enough to walk all day, and the light on the water at its best. Easter moves between late March and late April and fills the city completely when it lands. Book well ahead and expect company.
September
Go nowSummer warmth without August
Warm days, cooler evenings, the water still pleasant and the crowds thinning after the first week. The film festival takes over the Lido at the start of the month, which affects the island rather than the city. The single best month if you only get one.
October
Worth it, butQuieter and cheaper, with the tides starting
Fewer visitors, lower prices and pleasant walking weather, with the high-tide season beginning towards the end of the month. Take waterproof shoes and check the tide forecast. A good trade for most people.
March and June
Worth it, butThe edges of the good season
March is cool and can be wet, with the city noticeably emptier; June is warm and already busy, with the crowds building through the month. Both work. June gets long evenings and March gets space.
January and February
Worth it, butCold, foggy, empty — and then Carnival
The quietest and cheapest weeks of the year, with fog on the lagoon that is genuinely beautiful, and a real chance of high water. Carnival runs for about two weeks ending the day before Ash Wednesday, which moves between early February and early March, and during it the city is as full as in August.
July and August
Think twiceHot, humid, and the peak of the crowds
The hottest and most crowded weeks, with humidity that sits on the canals and queues at every major sight. Prices are at their highest and the day-tripper fee applies on most of these days. It is the version of Venice everyone complains about, and it is avoidable.
November and December
Think twiceThe wettest months, and the highest tides
Cold, damp and the peak of the acqua alta season, with short days and frequent grey. The city is cheap and quiet and the museums are empty, which is a real argument. What you lose is the outdoors, and in a city you experience by walking that is most of it.