The land-sea-breeze system, driven by the thermal contrast between the land and the adjacent ocean, is a widely known atmospheric phenomenon near coastal regions globally. The South-west coast of Australia experiences a strong persistent land-sea-breeze system (LSB) in summer months. This phenomenon plays a significant role in characterizing coastal currents. This study aims to investigate (1) the local diurnal wind characteristics comprising LSB and (2) its influence on surface current along the north-south oriented coastline near the south-west coast of Australia by numerical simulation. To simulate oceanic currents, Regional Ocean Modelling System (ROMS) has been used. A typical sea breeze dominated summer day is characterized by a counter-clockwise rotating wind cycle with diurnal repetitions. This study shows that a small area near 115.5°E, 33°S is formed to initiate sea breeze in the morning which expands very fast along the shoreline and then gradually along the cross-shore direction. The evolution, horizontal extent and propagation properties of sea breeze front (SBF) have been investigated for characteristic LSB cycle. Two SBF propagating in opposite direction has been identified - one towards offshore and another moving inland. The offshore extent of sea breeze is found to be about 114°E. The surface currents near coastline show a better correlation to wind forcing if compared to the same at further offshore locations. The counter-clockwise rotation and shape of wind ellipse show dominant wind direction to be affected by strong LSB during summer months and this is transferred to surface current ellipses. A comparison between Power Spectral Density Analysis of both wind and surface currents also supports the same notion. The findings of this study provide insights to the spatial-temporal variation of land-sea breeze and its effect on surface currents which can be useful for understanding the local coastal dynamics better.