Sasebo's winters are mild, with temperatures rarely dropping below freezing, averaging around 8-9°C in January and December. Spring arrives in late March, bringing warmer days with temperatures often reaching the mid-20s, while autumn is similarly pleasant, with October experiencing a gentle cooling. Summer months from June to August are hot and humid, with temperatures frequently soaring above 30°C, although there can be some respite during evening storms. Autumn and spring are the most comfortable seasons, with mild temperatures and gentle breezes making them ideal for outdoor activities.