Summer '76, there's a heatwave and the Swiss countryside is drying out at top speed. In this stifling environment, Gus who is thirteen years old and son of a farmer, sees both his family environment and his innocence relentlessly breaking. He's living the end of a world.

Bob is sent to a remote area to repair a radio transmitting antenna. Once there, he is surprised to discover that it is connected to a construction site by a mysterious cable.

Erik is a solitary woodcutter. Kevin is the young conductor of the village's cycling brass band. Erik never goes out without his old mare. Kevin is keen on the clarinetist. The clarinetist is crazy about horses. But Erik doesn't know how to give. And Kevin doesn't know how to flirt. They will both need to learn.

Seventeen-year-old Tatiana skips school with her friends in order to say goodbye to a boy whom she is unwilling to part with.

Every day, Sophie sees her husband Augustin leaving the house to work for his small dairy farm. He gives all his strength to his work. Yet, since some time now, his farm production is not sufficient for his family to survive financially anymore. Sophie does not know the situation, but for how long ?

C'est déjà l'été is a portrait of a family, but above all the story of a teenager who's life seems to be pushed of track by the lack of a normal family and desperately, purely by instinctive battle, tries to lift himself out of his wretched, semi-feral existence.