Based on the analysis of different weather systems of 34 typical high temperature cases in the coastal areas of Guangxi from 2007 to 2019, conceptual models of high temperature weather in the coastal areas of Guangxi are established in this paper. There are four types: Subtropical High+Tropical Cyclone, Subtropical High, Subtropical High+Southwest Warm Low Pressure and Tropical Cyclone. The warming situation is mainly caused by the vertical downdraft and the warm advection supply by the southwest jet. The Subtropical High+Tropical Cyclone temperature increasing is mainly caused by the downdraft at the bottom of the subtropical high and the periphery of the typhoon. The subtropical high type is mainly affected by the downdraft which is caused by the easterly flow at the bottom of the continental anticyclone or under the control of the subtropical high over the western Pacific. The Subtropical High+Southwest Warm Low Pressure is mainly affected by the downdraft of the subtropical high and the warming transport of southwest jet on the edge of Southwest Warm Low Pressure. The Tropical Cyclone type is mainly affected by the temperature increase caused by the downdraft on the edge of the typhoon.