Summer is probably the worst time of year to be in Venice - average daytime temperatures hover around 27°C (81°F) but can go considerably higher. High humidity also makes for rather sticky weather, and the combination of heat haze with air pollution makes it highly unlikely you'll be able to espy the Alps from any point in the city. Prevailing winds (the sirocco) are from the south and hot.
In spring the weather is often crisp and clear and the temperatures pleasant. That said, quite a lot of rain falls in May and into June. In July and August the humidity can bring cracking storms in the evening. The first half of winter sees heavy rainfall, with flooding most likely in November and December. On bad days, the city and lagoon are enveloped in mist (which some find enchanting), but every now and then you get lucky and the sky clears. January and February are the coldest months, with average temperatures hovering between 0°C (32°F) and 7°C (44°F). Because of its position on the lagoon, snow is a rarity.
| Month | Temperature | Rainfall | Humidity | Hrs of sunshine | ||
| Min | Max | AM | PM | |||
| Jan | 1 | 6 | 37 | 86 | 76 | 3 |
| Feb | 4 | 8 | 48 | 80 | 76 | 4 |
| Mar | 5 | 12 | 61 | 86 | 68 | 5 |
| Apr | 6 | 17 | 78 | 86 | 67 | 6 |
| May | 14 | 21 | 65 | 85 | 69 | 8 |
| Jun | 17 | 25 | 69 | 83 | 65 | 9 |
| Jul | 19 | 27 | 52 | 82 | 64 | 10 |
| Aug | 18 | 27 | 69 | 84 | 63 | 8 |
| Sep | 16 | 24 | 59 | 87 | 64 | 7 |
| Oct | 11 | 19 | 77 | 88 | 68 | 5 |
| Nov | 7 | 12 | 94 | 88 | 75 | 2 |
| Dec | 3 | 8 | 61 | 88 | 79 | 3 |