Why is durban warmer than Johannesburg?

Durban is warmer than Johannesburg primarily due to its coastal location along the Indian ocean, which moderates temperatures and results in a milder, more humid climate. In contrast, Johannesburg is situated at a higher altitude (about 1,753 meters or 5,751 feet) in the interior of South Africa, leading to cooler temperatures, especially at night. Additionally, Durban experiences more rainfall and a subtropical climate, while Johannesburg has a more temperate climate with distinct seasonal variations.