Persiennes translates to "shutters" or "blinds". It's a less common word in everyday French songs, making it stand out.
In the song, the lyric "Comme le feu dans les persiennes" (Like the fire in the shutters) evokes a vivid image of light and heat filtering through, suggesting a lazy, perhaps even stifling, summer atmosphere. It adds a touch of poetic detail to the description of the season.
Pépite's "L'été" [Summer] feels like a hazy, almost dreamlike reflection on a summer that's slipping away. The lyrics start with a feeling of escape, "Parti d'ici comme si tout était fragile / Comme si on voulait fuir" [Left here as if everything was fragile / As if we wanted to flee], even from a seemingly peaceful summer. There's a bit of a detached vibe, with the radio playing "chansons débiles / Des choses futiles" [stupid songs / Futile things], as if everything is just… happening.
I love how the song describes just drifting through the season: "Et je traîne comme le soleil" [And I drag like the sun] and "Je laisse passer l'été" [I let the summer pass]. It's not about actively doing things, but more about observing time go by, with lines like "Jamais regarder derrière moi" [Never look behind me] and "Je laisse aller le temps" [I let time go]. Even as "La chaleur monte autour" [The heat rises around], there's a sense of letting go and just being present in that moment, in a place "Là où tout encore brille / Comme si tout était facile" [Where everything still shines / As if everything was easy].