Sorrento in May Sorrento weather in May is pleasant with nice evenings, as temperatures are between 14° and 24° degrees. As there are on average 9 days of rain in Sorrento in May, it is most recommended to walk around with umbrella and keep on update regarding the weather before outdoor activity. Either way, it is recommended to check the exact weather forecast for Sorrento before arriving, as the weather forecast becomes more accurate closer to the checked date.