Dee Why Beach runs for 1.8 kilometres from the base of Long Reef Point to Dee Why Point. The beach is backed by Long Reef Reserve and golf course in the north, with Long Reef Surf Club and car park located north of the usually closed entrance to the small Dee Why Lagoon. South of the Lagoon entrance is a relatively natural vegetated sand barrier, part of the Dee Why Lagoon Wildlife Reserve.

Good swimming and body surfing conditions. Excellent board riding on point and centre of the beach. Best at South corner in south or south easterly winds.

Dee Why has parking available that is free for vehicles displaying Warringah Council's Car Parking stickers and Pay'n'Display is available for those without.

Dee Why Beach is patrolled by professional Lifeguards seven days a week. On weekends and Public holidays this is supplemented by Surf Life Saving Club Volunteers.