The weather is South Dakota is temperate - although winters can be quite harsh. With heavy snowfall, ice storms and bitter cold temperatures, it's not the best time to visit unless winter sports are your thing. The best time for most travelers to take a trip to Pierre is during the summer months when temperatures are warm and the air is dry. Due to its landlocked position, the climate is generally drier than in other parts of the country (except in the winter when there can be a lot of snowfall).