If you're looking for summer vibes, the best time to travel to Kushiro is in July, August and September, when the average temperature reaches 18.12 °C, while May, April and October are the 3 sunniest months of the year, with an average of 22.13 hours.
However, if you prefer colder temperatures, make sure you visit Kushiro during January, February or December to experience an average of -4.25 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and March, when the average precipitation in Kushiro is 5.65 mm, while the months of January, February and March are drier, with an average of 0 mm.