June in Seguin is the rainiest month of the year. In June, the weather in Seguin is typically hot. Average daily high temperature in June is about 32 degrees above zero. On average, Seguin has 20 sunny, 9 rainy, and 1 partly cloudy day in June. The rains are usually heavy. June as well as January, August, and December is considered the most uncomfortable time to visit Seguin.