The Mediterranean weather in Sardinia allows travellers to relish enchanting holidays year round as registers show an average of about 300 sunny days yearly. As seasons seem to extend further than in any other place on the world except for winter which is brief and mild. Spring comes earlier in March with its first warm days. Summer also seems to announce its start beforehand in May. The water around the island is perfect to take a dip from June to September. When autumn has already arrived, there are still some warm summer days which resist leaving and still some chances of swimming. If it rains it happens generally in autumn or winter. November brings some winter days, yet they are not at all cold and the season lasts just for a brief span of time. Snow can be found only high in the mountainous area. The frequently dry and cool Mistral blows from the northwest throughout all seasons and creates around the island a perfect sailing destination.
To know daily the weather in different town in Sardinia link:  

http://weather.yahoo.com/italy/sardinia/porto-cervo-721079/