The urban landscape pattern is increasing changed as cities replace their natural land cover with impervious surfaces, buildings, and other infrastructure. The impacts of landscape changes have become a growing concern particularly for the ecosystem service in recent decades. It is well-known that city parks could provide multiple ecosystem services including temperature regulation services in different seasons. Some thermal characteristics of city parks may directly contribute to the degree of comforts for the mankind, such as the land surface temperature (LST), near-surface air temperature (NAT), and relative humidity (RH). Generally, landscape types and pattern in parks are responsible for the extent and degree of local thermal effects. In this study, three city parks were selected to analysis the diurnal variations of thermal effects in Beijing. We measured LST, NAT, and RH in the grassland, forest, road, and bare land for three months from the later autumn to early winter. The study aims to assess the variations of LST, NAT, and RH as well as their relationships among different landscape types. The results showed that: (1) the lowest LST and NAT are at 8:00 whereas the highest values are different according to the types of landscape. The highest values of LST and NAT are at 14:00,12:00,14:00,12:00, respectively. The relative humidity reaches its lowest value at 14:00 (2) In the daytime, the decreasing orders of mean LST, NAT, and RH are bare land > road > grassland≈forest, bare land > forest≈grassland=road, grassland≈road≈forest≈bare land, respectively. The LST and NAT are increasing with the decreasing RH for all landscape types. (3) The maximum difference in LST, NAT, and RH decrease as: bare land (13.5℃) > road (10.0℃) > grassland (7.5℃) > forest (5.9℃), bare land (7.4℃) ≈ road (7.3℃) > forest (6.3℃) > grassland (5.7℃), bare land (20.8%) = road (20.8%) ≈grassland (19.5%)≈forest (18.8%), respectively. (4) The relationship between LST and NAT are complex due to the various solar radiations in a day. Specifically, the daily variation of LST is greater than that of NAT for all the landscapes. The daily variation of LST and NAT is low in forest compared with the high variations in temperature of the grassland, bare land, and road. (5) The combination of temperature and humidity is represented by the difference between NAT and dew-point temperature. The hydrothermal environment reaches the driest and hottest conditions at 14:00. By quantifying thermal effects of different landscape types in city parks, this study can provide useful implication on the urban management to improve the thermal environment and related ecosystem services.