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An increase in carbon dioxide (CO 2) concentrations in the atmosphere due to anthropogenic activities is responsible for global warming and hence in recent years, CO 2 measurement network has expanded globally. In the monsoon season (July-September) of year 2011, we carried out measurements of CO 2 and water vapour (H 2 O) concentrations along with wind and air temperature over a tropical site in southeast India having rural topography. To collect these observations, the instrumentations used were the sonic anemometer for wind and temperature, and the open path H 2 O/CO 2 infrared gas analyzer for CO 2 and H 2 O concentrations. Using these observations, we explored the diurnal variability of CO 2 flux along with sensible and latent heat. The CO 2 flux was positive during night-time and negative during daytime and in phase with convective instability. The CO 2 flux relationships with the meteorological parameters such as wind speed, temperature and heat fluxes have been analysed. The seasonal (monsoon) half hour mean of CO 2 flux which was −3.55 μmol m −2 s −1 indicated the experimental site as a CO 2 sink region (net seasonal uptake). An increase in CO 2 concentrations during weekends was not observed due to unavailability of heavy vehicular traffic.