Alderney Weather, climate and geography

Weather and climate

Best time to visit

The island enjoys a temperate climate with warm summers and milder winter temperatures than those experienced in the UK. The most popular holiday season is from April to October, with temperatures averaging 20-21°C (68-70°F). These months give an average of 200 and 260 hours of sunshine. Rainfall is mainly during the cooler months. The sea is 17°C (63°F) on average during the summer.


Alderney is the most northerly of the Channel Islands, being 32km (20 miles) from Guernsey and just 12km (8 miles) off the coast of Normandy. The island rises 76 to 90m (250 to 296ft), with a mostly treeless flat plateau. At the south end steep cliffs fall into the sea and on the northern, eastern and southeastern sides, the land slopes gradually down to bays. The climate is milder than the mainland, with hot summers and drizzly winters.

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