Climate and Weather

Environment

The Isle of Wight enjoys one of the most favourable climates in the United Kingdom. The island records over 1,900 hours of sunshine per year, more than almost anywhere else in Britain. The south coast, particularly the sheltered Undercliff area around Ventnor, has a notably mild microclimate.

Summer temperatures average between 19 and 21 degrees Celsius, with occasional hotter spells reaching the mid-twenties or above. Winters are mild, with frosts less frequent than inland areas of southern England. Average winter temperatures are around 5 to 7 degrees Celsius. Snow is uncommon, falling on only a handful of days per year on average.

Rainfall is lower than the national average, at approximately 750 millimetres per year. The driest months are typically May to July. The island can experience periods of summer drought, which affects the chalk aquifer that supplies much of the island's water.

Wind is a significant factor, particularly on exposed south and west coasts. Autumn and winter storms can bring strong winds and rough seas. The chalk cliffs of the south coast are susceptible to storm damage and erosion. Sea fog can affect the coast, particularly in spring and early summer.

The microclimate of the south coast allows subtropical and Mediterranean plants to grow outdoors at Ventnor Botanic Garden, including species rarely seen elsewhere in Britain. This sheltered south-facing aspect, protected from north winds by the downs, creates growing conditions unique in the UK.