If you're looking for summer vibes, the best time to travel to Oita is in August, July and September, when the average temperature reaches 25.03 °C, while May, March and April are the 3 sunniest months of the year, with an average of 34.98 hours.
If you prefer colder temperatures, however, make sure you visit Oita during the months of January, February and March to experience an average of 1.91 °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 Oita is 8.25 mm, while the months of January, February and March are drier, with an average of 0 mm.