REUTERS/Denis Charlet
An increase in output of about 1.8% was expected, but the actual figure came in at less than half that level, up by just 0.9%.
Month-on-month, production fell 0.5% from July's level.
France already recorded a particularly strong set of figures for industrial production in August, with a rise of 1.6% on the month alone.
But Germany, the eurozone's industrial powerhouse, revealed a 1.2% drop on the month.