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It will be spring weather temps in Venice last April were Min 8 Max 16 degrees the highest recorded was 20 degrees. Whilst there could be some places you visit could be a bit warmer this is the most likely temps range you might find, if I could tell what the actual temp would be I would be worth a fortune, but enjoy your holiday whatever the weather.
As Bill says temperatures can still be quite low in the Med. in early April and although you will probably get some really good sunny conditions in parts. You should also take a fleece and some rainwear. The water will be starting to warm up apart from the Adriatic which is filled by the many rivers out of the Alps, Dolomites and the Voralberg region so melting snow keeps the water there cold and consequently affects the air temperature. ......Neil.