weather in shannon, ireland
Average Weather in Shannon Ireland. Shannon has a mild humid temperate climate with warm summers and no dry season. The temperature typically varies from 38Â°F to 67Â°F over the course of the year, and is rarely below 30Â°F or above 75Â°F. The warm season lasts for 101 days, from June 7 to September 16, with an average daily high temperature above 63Â°F.