January in Sweetwater is the sunniest month of the year. In January, the weather in Sweetwater is typically warm. Average daily high temperature in January is about 12 degrees above zero. On average, Sweetwater has 25 sunny, 5 partly cloudy, and 1 rainy day in January. The rains are usually heavy. January as well as June, July, August, and December is considered the most uncomfortable time to visit Sweetwater.