Why can the weather feel so different between two places on the same day?

Geography is the short answer. Ireland is a small island in the Atlantic, and weather systems hit the west first, weaken or reorganise as they cross, and can leave the east in a rain shadow behind the mountains. High ground forces damp air upwards, so the windward side of a range takes the rain while the next valley sits in sun. Sea breezes, sheltered bays and exposed headlands can sit ten kilometres and two climates apart, and a sea fog can hold one beach in grey while the town behind it is in shirtsleeves. Showers are local by nature: one cell can soak a town and miss the next. Plan by the forecast for your destination, dress in layers, and do not judge the day by the weather at breakfast.

Useful pages: The best time to visit Ireland · Irish weather, month by month · What to wear · Weather in Ireland · Experiencing the Irish coastline · Ireland's national parks · Outdoor adventures in Ireland · Travel notices · Ireland photography tips · Ireland weather guide

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