May in Zheleznovodsk is the rainiest month of the year. In May, the weather in Zheleznovodsk is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Zheleznovodsk has 24 rainy and 7 sunny days in May. The rains are usually heavy. May as well as March and April is considered the most uncomfortable time to visit Zheleznovodsk.