We investigate the ocean wave eld under Hurricane SAM (2021). Whilst measurements of waves under Tropical Cyclones (TCs) are rare, an unusually large number of quality in situ and remote mea- surements are available in that case. First, we highlight the good consistency between the wave spectra provided by the Surface Waves Investigation and Monitoring (SWIM) instrument onboard the China- France Oceanography Satellite (CFOSAT), the in situ spectra mea- sured by National Data Buoy Center (NDBC) buoys, and a saildrone. The impact of strong rains on SWIM spectra is then further investi- gated. We show that whereas the rain de nitely a ects the normalized radar cross section, both the innovative technology (beam rotating scanning geometry) and the post-processing processes applied to re- trieve the 2D wave spectra ensure a good quality of the resulting wave spectra, even in heavy rain conditions. On this basis, the satellite, air- borne and in situ observations are confronted to the analytical model proposed by Kudryavtsev et al (2015). We show that a trapped wave mechanism may be invoked to explain the large signi cant wave height observed in the right front quadrant of Hurricane SAM.