For example, on Tuesday August 25th 2026, the UV Index for the hottest part of the day in most of mainland Spain hovers around 7-10, whereas in the Canary Islands it reaches it will reach an 11. She recommends that people in the Canary Islands avoid the sun between midday and 6pm, use broad-spectrum sunscreens which protect against ultraviolet A and ultraviolet B radiation and a sunscreen with a factor not lower than 30. Those heading to the mountains instead of the coast this summer should take extra care from the sun as the UV Index can reach its highest in places of high altitude and you risk being exposed to more radiation.