The highest monthly temperature in Chongqing reached 41.3 ℃ in August 2022, and the hot weather lasted for 28 d. Under the high-temperature weather, the ozone does not exceed the standard in Chongqing city in August; while the overall temperature in July is lower than that in August, there are 7 ozone pollution days. By using observations and the WRF (Weather Research and Forecasting) model, this phenomenon is analyzed and the relationship between ozone and meteorological conditions in different areas is comprehensively explored. The results are as follows. (1) The temperature, boundary layer height and wind speed in August are relatively high, while the relative humidity is relatively low, which may be conducive to the improvement of ozone pollution in August. On the whole, the mass concentration of ozone in Chongqing first increases and then decreases with the increase of air temperature and boundary layer height. When the air temperature is higher than 30 ℃, the boundary layer height is higher than 1 000 m, the relative humidity is lower than 59% and the wind speed is lower than 6.3 m[DK]·s-1, the mass concentration and excess rate of ozone go up significantly. However, when the air temperature, boundary layer height, relative humidity and wind speed exceed 39 ℃, 2 800 m, 59% and 6.3 m[DK]·s-1, respectively, the mass concentration and excess rate go down significantly. (2) When the temperature in the main urban area and suburban counties (districts) exceed 38 ℃ and 37 ℃, respectively, the increase in the mass concentration of ozone becomes smaller or the mass concentration appears to decline; when the temperature in several counties (districts) is between 38 and 40 ℃, the mass concentration still maintains an upward trend. (3) On pollution days, the 2-h peak of increase of ozone and boundary layer height in Shapingba and Changshou districts occurs at 11:00 or 13:00 at the same time, while that in Hechuan and Rongchang districts occurs at different times. The study provides reference for the prediction, prevention and control of summer ozone pollution in Chongqing.