May weather forecast in Kelso

In May, the weather in Kelso is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Kelso has 19 rainy, 6 sunny, 3 cloudy, and 3 partly cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Kelso.