Overview: Rio de JaneiroRio de Janeiro (Brazil) in general has a tropical climate. Temperatures during the day are in the range from 24 °C (75 °F) in July to 30 °C (85 °F) in February. The least rainy month in Rio de Janeiro is June with its 7 days of rain, the rainiest month is December, when it rains 19 days. The highest night temperatures could be experienced in February with 21 °C (70 °F), the lowest in July with 15 °C (59 °F). Sea temperatures are in the following range: 21 °C (70 °F) in September to 25 °C (78 °F) in March.