Hydrogen energy applications can be usedoutdoor and thus exposed to environmental varying conditions like wind. In several applications, natural ventilation is the first mitigation means studied to limit hydrogen build-up inside a confined area. This study aims at observing and understanding the influence of wind, on light gas build-up, in addition. Experiments were performed with helium as releasing gas, in a1-m3enclosure equipped with ventilation openings, varying wind conditions, openings location, release flow rate; obstructions in front of the openings to limit effects of wind were studied as well. Experimental results were compared together and with the available analytical models.