Based on the hourly ground observation data of 59 national meteorological stations in Liaoning Province from June to August in 2008 to 2017, considering the adverse effects of summer climatic suitability and high impact weather on summer tourism, this paper determines the evaluation method of climate suitability for summer tourism in Liaoning Province, analyzes the temporal and spatial distribution of summer tourism suitability, and provides references for the public and tourism departments to understand the local summer tourism climate resources. The results show that: (1) The suitability of summer tourism in Liaoning Province gradually increased from northwest to southeast. Among the 59 cities in Liaoning Province, 14 were very suitable for summer vacation, 22 were suitable for summer vacation, and 16 were relatively suitable for summer vacation. (2) In summer, most of Liaoning’s summer tourism climatic comfortability showed good, and the climatic comfortability of eastern and southern Liaoning showed better than that of central and western Liaoning. Benxi in the east of Liaoning Province and Dandong, Dalian, Huludao and the south of Jinzhou in the coastal areas had the highest climatic comfortability level and better weather conditions for summer holidays. (3) In summer, the highrisk areas of rainstorms were Kuandian, Dandong and Fengcheng in the Southeast. The highrisk areas of high temperature were in most of Chaoyang and the west of Jinzhou. The highrisk areas of gale were north of Tieling, Zhangwu, Jinzhou, Yingkou and Changhai. The highrisk areas of thunderstorms were Tieling, Eastern Fushun, Western Chaoyang and Zhuanghe in Dalian. (4) June and August were suitable months for summer tourism in Liaoning Province; especially in June, the suitability of summer tourism was the highest, and the suitable area was the largest. The suitability of summer tourism in August showed secondly good, and that in July showed relatively bad.