The Jiangmen Underground Neutrino Observatory (JUNO) is a huge, radiopure, liquid scintillator based neutrino detector currently under construction in China. Its program encompasses a comprehensive range of measurements, including neutrino fluxes from various natural sources such as solar, atmospheric, geo-, and supernova neutrinos (core-collapse and diffuse background). This contribution reviews the potential of JUNO to improve measurements of neutrinos from natural sources and focuses on factors and conditions necessary for achieving the corresponding physical targets.