January weather forecast in Onna

January in Onna is the rainiest and the coldest month of the year. In January, the weather in Onna is typically warm. Average daily high temperature in January is about 18 degrees above zero. On average, Onna has 20 rainy, 6 cloudy, 4 sunny, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February, May, June, and December is considered the most uncomfortable time to visit Onna.