We have examined accuracies of Moderate Resolution Imaging Spectroradiometer (MODIS) aboard Terra and Aqua using near-real-time sea surface temperature (SST) algorithm produced by Japan Aerospace Exploration Agency, Earth Observation Research and application Center (JAXA/EORC). The algorithm was tuned by buoy bulk SST observation around Japan in the period from February to April, 2004. The Multi-Channel SST (MCSST) coefficients were derived for each satellite and day/night separately. In daytime algorithm, the triple-window algorithms are applied using the brightness temperatures at 8.7, 11, and 12 μm. In nighttime algorithm, the brightness temperature at 3.7 μm is adopted additionally. The estimated SST is evaluated with reference to the buoy bulk observation in the period from April 2003 to July 2004. In daytime algorithm, accuracies of MODIS SST show the seasonal change.