weather in st. ives cornwall
Weather Overview for St Ives. 1  St. Ives, on the north coast of Cornwall in England, has a mild temperate climate. 2  Summers in St. Ives, from June till August, sees average highs around 18Â°C. 3  Autumn in St. Ives, from September till November, sees temperatures drop from 16Â°C to 11Â° 4 C. Winter is very warm in comparison to the rest of England.