When Is The Best Time To Go To Ireland

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I want to go to ireland in a few months and I’m not sure what the best time would be. I’ve only been to Ireland once before, but it was a month long trip with my family. The weather is truly unpredictable! It’s usually cool at night and sunny during the day, but sometimes its nice and warm for awhile then suddenly get cold again. We were there from March until May so we had great weather through out most of our stay, then after that it rained all summertime 🙁 Anyway do you know when the best season would be? From spring until fall or from winter until spring? Any advice would be greatly appreciated 🙂