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The effects of a low pressure fog system in naturally ventilated greenhouses were studied. Air temperature, humidity, leaf temperature and transpiration rate as functions of spray rate, canopy density, vent configuration and outside weather conditions were considered. One of the naturally ventilated greenhouses was cooled by fogging while the other was not. The fog reduced air temperature by 1.0 oC and leaf temperature by 1.1 oC. Relative humidity increased by 9% and transpiration rate was reduced by 6.5 mg/(m2s); spray rate was found to be the most important factor affecting the performance of fogging .Solar radiation did not turn out to be a significant factor affecting air temperature cooling.