Coastal currents of the Persian Gulf with a horizontal resolution of 2-minutes of latitude and longitude and 10 sigma vertical layers were simulated using a numerical coherence model. The simulation results revealed that surface water intrusion of the Indian Ocean into the Persian Gulf gradually increases from January to June, reaching its highest level in June and starts its decline in July and August. Due to the influence of the salinity flux, especially in the coastal area of Iran, the velocity of the currents increases as well. The model results indicated a southeastward current along the coasts of Kuwait and Saudi Arabia. The mentioned current is stronger in spring and summer as compared with other seasons and is significantly attenuated in winter due to thermohaline circulation and wind-induced currents.