In April, the weather in Tomakomai is typically cold. Average daily high temperature in April is about 7 degrees above zero. On average, Tomakomai has 10 rainy, 9 sunny, 8 partly cloudy, and 3 cloudy days in April. The rains are usually heavy. April as well as March, May, June, and August is considered the most uncomfortable time to visit Tomakomai.