We study in this paper characteristics of both wind velocity and temperature fluctuations due to a 2-day wave near the mesopause, by means of meteor echo measurements with the MU (middle and upper atmosphere) radar in Shigaraki, Japan (35 ¿N, 136 ¿E) and a meteor wind radar, newly constructed near Jakarta, Indonesia (6 ¿S, 107 ¿E). A 2-day wave was conspicuously enhanced on July 12--19, 1993, at both Shigaraki and Jakarta. Fluctuations of temperature and northward wind were inphase in Shigaraki, and they became antiphase in Jakarta, consistent with a prediction assuming a Rossby-gravity wave. The phase lag of the fluctuations between the two sites suggested that this wave propagated westward with a zonal wavenumber of 3. Seasonal variations of the 2-day wave in Jakarta were examined by using a frequency spectrum and complex demodulation technique for temperature and wind fields, finding clear enhancements during periods corresponding to summer months in each hemisphere, especially in January 1993. The dominant wave period was fairly stable and was confined in a narrow range centered around 47 and 49 hours during summer months of the southern and northern hemispheres, respectively. The phase variations of temperature preceded those for the northward wind by 180¿--225¿ when an enhanced 2-day wave was seen in the northward component, indicating their antiphase relation in the southern hemisphere. These results strongly support the interpretation of the 2-day wave near the mesopause as the (3, 0) mode of a Rossby-gravity wave with zonal wavenumber of 3. ¿ American Geophysical Union 1996