 Vector-borne diseases are becoming more prevalent due to global warming. The basic reproduction number, R0, a measure of a disease's epidemic potential, is highly dependent on temperature. This study examined how climate change could affect the R0 of two major vector-borne diseases, Zika and Dengue, in four different regions of Brazil. The study found that the R0 of Zika will increase with rising temperatures, while the R0 of Dengue will remain relatively stable. In addition, the study predicted that the R0 of Zika will increase in all four regions of Brazil, while the R0 of Dengue will remain relatively constant.