 The first description of a disease resembling dengue fever, DF, was in the 15th century slave trade era by Spanish sailors visiting the Tanzania coast. This disease, which was believed to be caused by evil spirits, is now known to be caused by four serotypes of dengue virus, DENV1-4, that are transmitted by 80s mosquitoes. Kenya has experienced multiple outbreaks, mostly associated with DENV2. In this study, plasma samples obtained from 37 February patients during a DF outbreak at Kenya's south coast in March 2019 were screened for DENV. Total RNA was extracted and screened for the alpha and flaviviruses by real-time polymerase chain reaction QPCR. DENV3 was the only virus detected. Shotgun metagenomics and targeted sequencing were used to obtain DENV whole genomes and the complete envelope genes, e-gene, respectively. Sequences were used to infer phylogenies and timescale genealogies. Following maximum likelihood and Bayesian phylogenetic analysis, this article was authored by Eric M. Muffenge, Gaffiai Kimida, Josfit Naitaya, and others.