What to wear to Nuits Sonores: Lyon sits at 20°C (68°F) by day and 10°C (50°F) at night in May, on industrial site, with a moderate chance of rain. That means a light base with one warm layer you can carry, cushioned trainers or a low boot, and a bag small enough for the gate rules. The crowd leans techno, underground and warehouse, so black and functional reads as insider.
Women's outfits at Nuits Sonores have to clear the same three hurdles as everyone else's. 20°C (68°F) by day, 10°C (50°F) at night, industrial site underfoot, with more options for solving them.
The dominant aesthetics at Nuits Sonores are techno black, underground, warehouse and urban. That is the visual language of the site, the stages, the merch, the crowd photos, and outfits that speak it look intentional rather than borrowed.
This is a function-first crowd. Black, utility and good shoes read as insider; heavy glitter and fancy dress read as tourist. Nobody is stopping you, but you will feel it.
What people actually wear: one good layer over a light base, because the temperature halves after sunset.