The best time to visit Ireland is between March and May, and September to November when it’s not as crowded as it is in summer, or as cold as it is in winter.
Ireland has an oceanic climate, cool and damp, cloudy and rainy throughout the year. Summer heat and winter frost are rare.
Temperatures do not vary much; however, the western coasts are milder in winter and cooler in summer. The southwest coast is particularly mild in winter.
In Ireland, Atlantic weather fronts move relentlessly one after another over the country, resulting in a rapid succession of cloudiness and sunshine, rain showers and subsequent improvements. Days with completely clear skies are rare: the weather is more likely to be variable or unstable, and in the interludes between disturbances you can expect, rather than clear skies, clouds running in the sky.