Abstract: Sea fog is a hazardous weather condition that poses a threat to navigation safety and plays a significant role in the ice-ocean-atmosphere interaction in the Arctic. In this study, we analyzed the differences in near-surface meteorological characteristics during sea fog, stratus, stratocumulus precipitation, and other cloud types in the Arctic warm season (April to October) using the International Comprehensive Ocean-Atmosphere Data Set (ICOADS), ECMWF Reanalysis v5 (ERA5), and meteorological station observation records from 2000 to 2019, and four typical prolonged sea fog cases were used for validation. The results indicate that the maximum relative humidity usually occurs at 1 000 hPa with an average of 93.43% and the 2 m dew point depression is within 0-1 °C during sea fog events. Inversions below 900 hPa are often observed, and wind speeds below 10 m/s from the south, southwest, and northeast are common during the Arctic warm season sea fog. In comparison, there are significant differences in near-surface meteorological characteristics between sea fog and stratocumulus, stratocumulus precipitation, and other cloud types. The mean relative humidity at 1 000 hPa during these cloud types is about 10% lower than that during sea fog, with rare occurrences exceeding 95%. The 2 m temperature-dew point depression difference is generally higher than 1 °C, inversions below 900 hPa are less likely to occur, and wind speeds ranging from 0 to 20 m/s and various wind directions are reported.