Overview: HelHel (Poland) in general has a mild climate. Temperatures during the day are in the range from 2 °C (35 °F) in January to 22 °C (72 °F) in July. The least rainy month in Hel is April with its 8 days of rain, the rainiest month is November, when it rains 12 days. Sea temperatures are in the following range: 3 °C (37 °F) in February to 18 °C (65 °F) in August. Temperatures during the night go from -2 °C (29 °F) in February to 14 °C (57 °F) in July.