April in Sisian is the rainiest month of the year. In April, the weather in Sisian is typically cold. Average daily high temperature in April is about 7 degrees above zero. On average, Sisian has 24 rainy, 5 sunny, and 1 cloudy day in April. The rains are usually heavy. April as well as March, May, and October is considered the most uncomfortable time to visit Sisian.