The ship campaign MSM114/2 (ARC) with the German research vessel Maria S. Merian took place from 22 January to 23 February, 2023. The campaign started in Mindelo, Cape Verde, and ended in Punta Arenas, Chile. During the campaign, the Intertropical Convergence Zone (ITCZ) was completely crossed three times at an almost constant longitude of 23˚W yielding three profiles of the ITCZ. Afterwards, a storm was passed in the Roaring Forties, in the South Atlantic. Here, we present data from the Humidity And Temperature PROfiler (HATPRO) as part of a series of standardised data sets of the atmospheric and oceanographic observations gathered during the ARC campaign. The HATPRO is a passive microwave radiometer which provides profiles of temperature, potential temperature, relative and absolute humidity up to 10000 m, and column-integrated water vapour and liquid water path. Additionally, the rainfall rate is included in the data set.