April in 13 let Kazaxstana is the rainiest month of the year. In April, the weather in 13 let Kazaxstana is typically warm. Average daily high temperature in April is about 12 degrees above zero. On average, 13 let Kazaxstana has 12 cloudy, 6 rainy, 6 sunny, and 6 partly cloudy days in April. The rains are usually light.