The UV index measures the strength of ultraviolet radiation from the sun on a scale starting at 0. From 3 and up it’s already worth protecting yourself, and in the Israeli summer values easily reach 8–11 and more — an "extreme" level at which unprotected skin can burn within minutes.

Radiation is strongest in the hours around midday, roughly between 10:00 and 16:00. If you can, plan your sea time outside that window. Either way: a wide-brimmed hat, sunglasses, a shirt, shade, and SPF 30+ sunscreen applied 20 minutes before going out and reapplied every two hours (and after swimming).

On the app’s UV screen you can see the current radiation index per beach and plan accordingly. Take special care with babies and children — their skin is far more sensitive, so keep them shaded and avoid direct exposure during peak hours.