The autonomous surface vehicle HALOBATES collected key climate variables, including sea surface temperature (SST) and salinity (SSS), during the RV Heincke cruise HE626 in the German Bight. HALOBATES recorded SST and SSS at seven different depths with a high vertical resolution of approximately 10 cm, ranging from the near-surface layer (NSL) (between 30 and 100 cm) to the sea-surface microlayer (SML) (uppermost millimeter). Temperature and conductivity (used for salinity calculation) were measured using conductivity, temperature, and depth (CTD) sensors connected to a flow-through system on HALOBATES. Additional temperature sensors were placed beneath the catamaran to capture in-situ temperature at six depths within the NSL. Salinity measurements were adjusted using discrete water samples to correct for any sensor biases. During the operation, two data loggers equipped with meteorological stations on the catamaran monitored essential weather conditions. HALOBATES was in operation from July 21, 2023, to August 8, 2023.