March in Eureka is the rainiest and the windiest month of the year. In March, the weather in Eureka is typically warm. Average daily high temperature in March is about 11 degrees above zero. On average, Eureka has 16 rainy, 8 sunny, 5 partly cloudy, and 2 cloudy days in March. The rains are usually heavy. March as well as January, February, November, and December is considered the most uncomfortable time to visit Eureka.