Overview: Great Smoky MountainsGreat Smoky Mountains (United States of America) in general has a mild climate. Temperatures during the day are in the range from 8 °C (46 °F) in January to 28 °C (83 °F) in July. The least rainy month in Great Smoky Mountains is October with its 8 days of rain, the rainiest month is July, when it rains 12 days. The highest night temperatures could be experienced in July with 16 °C (61 °F), the lowest in January with -4 °C (25 °F).