July is high summer, but Casablanca's Atlantic position makes it far kinder than inland Morocco. Daytime highs sit around 26°C — warm and bright, yet a world away from Marrakech's 38°C furnace — and a near-constant sea breeze keeps the city comfortable. The familiar summer haze still greys many mornings before clearing to sunny afternoons, so the seafront rewards a later start.
This is when Casablanca's coast is at its busiest and best. The Ain Diab beach clubs fill up, the Corniche buzzes into the warm evenings, and the esplanade around the Hassan II Mosque is a fine place to catch the sea breeze and the Atlantic sunset. Inland sights stay comfortable too, with the central market, the Habous quarter and the Art Deco downtown all easy in the gentler coastal warmth.
July also falls within the typical window for Jazzablanca in some years — the city's big jazz festival, usually around June or July, with dates that vary. For families and travellers who want a genuine beach-city summer without inland Morocco's heat, July works well: warm, breezy, lively and easy, provided you let the misty mornings warm into bright afternoons.