Overview: Antigua and Barbuda Antigua and Barbuda in general has a tropical climate. Temperatures during the day are in the range from 28 °C (83 °F) in January to 31 °C (88 °F) in August. Sea temperatures are in the following range: 26 °C (79 °F) in February to 29 °C (83 °F) in September. The least rainy month in Antigua and Barbuda is March with its 7 days of rain, the rainiest month is October, when it rains 13 days. The highest night temperatures could be experienced in August with 25 °C (77 °F), the lowest in February with 22 °C (72 °F).