Pacific Ocean suffers El Niño-La Niña sea surface oscillations which influences regional meteorological variables as surface temperature, wind fields and the diurnal development of the planetary boundary layer (PBL). In this work, we used WRF in order to evaluate its performance during the transition from weak La Niña to moderate El Niño phenomena, against surface observations and upper air measurements. Surface 2-m temperature was better described during moderate El Niño than weak La Niña event for selected settings. 10-m wind surface have not highlighted any influence. Upper air WRF validation was well described using PBL height estimations from LIDAR observations for comparison. Also, upper air WRF validation was considered against PBL height estimations based in bulk Richardson number from synoptic rawinsonde observations; however, these synoptic rawinsonde measurements usually failed in the estimation of the PBL height.