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World

North America

San Francisco Day 5 to 8 UV index

Local Time Tu Apr 20 We Apr 21 Th Apr 22 Fr Apr 23
UV index 7 7 7 7


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.


Last updated: Fr, 16 Apr, 19:11 BST

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