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Climate change significantly increased the occurrence of high temperatures. High temperature significantly reduces rice yield and quality due to induced floret sterility in rice. Organic manure is one of the nutrients that is expected to maintain the soil temperature of rice. The study aims to determine the effect of application organic fertilizer in high temperature during the flowering stage in several varieties of rice (Oryza sativa L.). This research was conducted in a greenhouse with an average temperature of 28–34 0C from July to December 2020. The experiment consisted of 3 factors, namely: Varieties of Rice, V (IR64 and Gogo); Application of Organic Fertilizer, O (with and without organic fertilizer); and High Temperature, T (35 and 40°C). The treatments were arranged in a completely randomized design with 4 replicates. Growth parameters observed were rice plant height, number of tillers, and rice biomass. The result showed that Interaction on varieties, application of organic fertilizer at a high temperature significantly reduce the rice plant height and rice biomass. The estimation of the global warming impact of rice growth can be predicted by this information and mitigating for it.