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North America

Seattle Seattle Chicago Chicago Billings Billings Minneapolis Minneapolis New York New York Raleigh Raleigh Memphis Memphis Miami Miami Dallas Dallas Denver Denver Phoenix Phoenix San Francisco San Francisco uv index  North America Forecast maps
Last updated: Sa, 16 Oct, 22:25 BST

The strength of the sun's ultraviolet (UV) radiation is expressed as a Solar UV Index or Sun Index.The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the two weeks around the summer solstice). Indices of 9 and 10 are common in the Mediterranean area. The Sun Index forecast refers to the daily maximum.