UV Index Today in Cook County, Illinois (IL) Friday, May 22, 2026 -1:38 PMCDT (GMT-5) The average maximum UV Index today across 177 locations in Cook County, Illinois (IL) , is 6.7. The highest projected maximum is 7.2 in Lockport at 1:00 PM CDT, while the lowest projected maximum is 6 in Northbrook at 1:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 7.6. The highest projected maximum is 8.1 in Romeoville at 1:00 PM CDT, and the lowest projected maximum is 6.5 in Northbrook at 12:00 PM CDT.
29 County Subdivisions in Cook County, Illinois (IL) Maximum UV Index Today
Barrington - 6.9
Berwyn - 6.8
Bloom - 6.7
Bremen - 6.7
Calumet - 6.8
Cicero - 6.8
Elk Grove - 6.6
Hanover - 6.9
Lemont - 7
Leyden - 6.4
Lyons - 6.8
Maine - 6.4
New Trier - 6.4
Niles - 6.4
Northfield - 6.4
Norwood Park - 6.4
Oak Park - 6.4
Orland - 6.7
Palatine - 6.6
Palos - 6.8
Proviso - 6.8
Rich - 6.7
River Forest - 6.4
Riverside - 6.8
Schaumburg - 6.6
Stickney - 6.8
Thornton - 6.7
Wheeling - 6.6
Worth - 6.8148 Places in Cook County, Illinois (IL) Maximum UV Index Today
Alsip - 6.8
Arlington Heights - 6.6
Barrington - 7.1
Barrington Hills - 7.1
Bartlett - 6.9
Bedford Park - 6.8
Bellwood - 6.6
Bensenville - 6.6
Berkeley - 6.6
Berwyn - 6.8
Blue Island - 6.8
Bridgeview - 6.8
Broadview - 6.8
Brookfield - 6.8
Buffalo Grove - 6.4
Burbank - 6.8
Burnham - 6.9
Burr Ridge - 7
Calumet City - 6.7
Calumet Park - 6.8
Chicago - 6.8
Chicago Heights - 6.7
Chicago Ridge - 6.8
Cicero - 6.8
Country Club Hills - 6.7
Countryside - 7
Crestwood - 6.8
Crete - 6.7
Deerfield - 6
Deer Park - 6.4
Des Plaines - 6.6
Dixmoor - 6.8
Dolton - 6.9
East Dundee - 6.9
East Hazel Crest - 6.7
Elgin - 6.9
Elk Grove Village - 6.6
Elmhurst - 6.6
Elmwood Park - 6.4
Evanston - 6.4
Evergreen Park - 6.8
Flossmoor - 6.7
Ford Heights - 6.7
Forest Park - 6.8
Forest View - 6.8
Frankfort - 6.7
Frankfort Square - 6.7
Franklin Park - 6.6
Glencoe - 6
Glenview - 6.4
Glenwood - 6.7
Golf - 6.4
Hanover Park - 6.9
Harvey - 6.7
Harwood Heights - 6.4
Hazel Crest - 6.7
Hickory Hills - 6.8
Highland Park - 6
Hillside - 7
Hinsdale - 7
Hodgkins - 6.8
Hoffman Estates - 6.9
Homer Glen - 7.2
Hometown - 6.8
Homewood - 6.7
Indian Head Park - 7
Inverness - 6.6
Itasca - 6.6
Justice - 6.8
Kenilworth - 6.4
La Grange - 6.8
La Grange Park - 6.8
Lansing - 6.7
Lemont - 7
Lincolnwood - 6.4
Lockport - 7.2
Long Grove - 6.4
Lynwood - 6.7
Lyons - 6.8
Markham - 6.7
Matteson - 6.7
Maywood - 6.4
Melrose Park - 6.4
Merrionette Park - 6.8
Midlothian - 6.8
Morton Grove - 6.4
Mount Prospect - 6.6
Niles - 6.4
Norridge - 6.4
Northbrook - 6
Northfield - 6.4
Northlake - 6.6
North Riverside - 6.8
Oak Brook - 7
Oak Forest - 6.7
Oak Lawn - 6.8
Oak Park - 6.4
Olympia Fields - 6.7
Orland Hills - 6.7
Orland Park - 6.7
Palatine - 6.6
Palos Heights - 6.8
Palos Hills - 6.8
Palos Park - 7
Park Forest - 6.7
Park Ridge - 6.4
Phoenix - 6.7
Plum Valley - 6.7
Posen - 6.8
Prospect Heights - 6.6
Richton Park - 6.7
Riverdale - 6.8
River Forest - 6.4
River Grove - 6.4
Riverside - 6.8
Riverwoods - 6.4
Robbins - 6.8
Rolling Meadows - 6.6
Romeoville - 7
Roselle - 6.6
Rosemont - 6.4
Sauk Village - 6.7
Schaumburg - 6.6
Schiller Park - 6.4
Skokie - 6.4
South Barrington - 6.9
South Chicago Heights - 6.7
South Holland - 6.7
Steger - 6.7
Stickney - 6.8
Stone Park - 6.6
Streamwood - 6.9
Summit - 6.8
Thornton - 6.7
Tinley Park - 6.7
University Park - 6.7
Westchester - 7
Western Springs - 7
Wheeling - 6.4
Willow Springs - 7
Wilmette - 6.4
Winnetka - 6.4
Wood Dale - 6.6
Woodridge - 7
Worth - 6.8
Dyer - 6.7
Hammond - 6.7
Munster - 6.7