January in Uyuni is the rainiest and the cloudiest month of the year. In January, the weather in Uyuni is typically warm. Average daily high temperature in January is about 17 degrees above zero. On average, Uyuni has 18 rainy, 10 cloudy, 2 sunny, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February is considered the most uncomfortable time to visit Uyuni.