Didim lies on the Aegean coast in Aydin Province, in Turkey's Aegean Region. Set on a peninsula facing the Aegean Sea, it has a distinctly coastal setting shaped by beaches, bays, and resort development.

The city's strongest historical identity comes from antiquity. The Temple of Apollo at Didyma is Didim's key historical landmark and one of the major ancient sanctuaries of western Anatolia. Didyma was an important oracle center in antiquity and was closely linked with the ancient city of Miletus, so a stay here can combine a major sanctuary within the destination with nearby classical history at Miletus.

Didim works as a seaside resort with direct access to major ancient sites and a nearby nature option. That mix makes it well suited to a holiday that combines beach time, archaeology, and short excursions, rather than a stay built around only one theme. It functions primarily as a seaside holiday base, not as a large urban center.

Altinkum is the best-known visitor area and the main setting for swimming, sunbathing, and seafront tourism. Didim Marina offers yacht berths, waterfront dining, and a more modern promenade atmosphere than the beach strips. Akbuk has a quieter bay feel, while the town center forms part of the local visitor network linked by dolmus minibuses with Altinkum, Akbuk, and other nearby areas. Many visitors arrive in Didim by road transfer from Milas-Bodrum Airport.

Didim has a Mediterranean climate, with hot, dry summers and mild winters. The main beach season runs from late spring into early autumn, with July and August bringing the hottest weather. Late spring, summer, and early autumn are the best periods to visit, while peak summer heat is the main time to avoid for visitors who are sensitive to high temperatures.