You can certainly sunbathe in Malaga in April, though the experience is more "pleasant" than "tropical." April marks the beginning of the sunbathing season on the Costa del Sol, with average daytime highs around 20°C to 22°C (68°F to 72°F). On clear, sunny days—of which there are many—the intensity of the Mediterranean sun can make it feel much warmer, especially if you are sheltered from the wind. It is common to see locals and tourists alike on the sands of La Malagueta beach during this time. However, the Mediterranean Sea remains quite cold in April, usually hovering around 16°C (61°F), so while sunbathing is enjoyable, swimming is generally reserved for the brave. You should also be prepared for cooler evenings, where temperatures can drop to 12°C, and the occasional "April shower," though these are typically short-lived. Overall, it is a perfect month for those who want a tan without the oppressive 35°C heat of the mid-summer months.