World
North America
Great Falls UV index
| Local Time | Th Sep 12 | Fr Sep 13 | Sa Sep 14 | Su Sep 15 |
| UV index | 1 | 4 | 5 | 5 |
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: Th, 12 Sep, 14:23 BST
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