January in La Rioja is the rainiest, the cloudiest, and the warmest month of the year. In January, the weather in La Rioja is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, La Rioja has 21 rainy, 6 partly cloudy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit La Rioja.