UV Index Today in Cook County, Illinois (IL) Sunday, September 20, 2026 -11:22 AM CDT (GMT-5) The average maximum UV Index today across 177 locations in Cook County, Illinois (IL) , is 1.8. The highest projected maximum is 3.4 in Bremen at 1:00 PM CDT, while the lowest projected maximum is 0.5 in Buffalo Grove at 3:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 1.9. The highest projected maximum is 2.5 in Northbrook at 12:00 PM CDT, and the lowest projected maximum is 1.3 in Lockport at 12:00 PM CDT.
29 County Subdivisions in Cook County, Illinois (IL) Maximum UV Index Today
Barrington - 0.8
Berwyn - 1.9
Bloom - 2.4
Bremen - 3.4
Calumet - 1.9
Cicero - 1.9
Elk Grove - 0.9
Hanover - 0.8
Lemont - 1.5
Leyden - 1.3
Lyons - 1.9
Maine - 1.3
New Trier - 1.3
Niles - 1.3
Northfield - 1.3
Norwood Park - 1.3
Oak Park - 1.3
Orland - 3.4
Palatine - 0.9
Palos - 1.9
Proviso - 1.9
Rich - 3.4
River Forest - 1.3
Riverside - 1.9
Schaumburg - 0.9
Stickney - 1.9
Thornton - 2.4
Wheeling - 0.9
Worth - 1.9148 Places in Cook County, Illinois (IL) Maximum UV Index Today
Alsip - 1.9
Arlington Heights - 0.9
Barrington - 0.6
Barrington Hills - 0.6
Bartlett - 0.8
Bedford Park - 1.9
Bellwood - 0.9
Bensenville - 0.9
Berkeley - 0.9
Berwyn - 1.9
Blue Island - 1.9
Bridgeview - 1.9
Broadview - 1.9
Brookfield - 1.9
Buffalo Grove - 0.5
Burbank - 1.9
Burnham - 2.5
Burr Ridge - 1.5
Calumet City - 2.4
Calumet Park - 1.9
Chicago - 1.9
Chicago Heights - 3.4
Chicago Ridge - 1.9
Cicero - 1.9
Country Club Hills - 3.4
Countryside - 1.5
Crestwood - 1.9
Crete - 2.4
Deerfield - 0.7
Deer Park - 0.5
Des Plaines - 0.9
Dixmoor - 1.9
Dolton - 2.5
East Dundee - 0.8
East Hazel Crest - 3.4
Elgin - 0.8
Elk Grove Village - 0.9
Elmhurst - 0.9
Elmwood Park - 1.3
Evanston - 1.3
Evergreen Park - 1.9
Flossmoor - 3.4
Ford Heights - 2.4
Forest Park - 1.9
Forest View - 1.9
Frankfort - 3.4
Frankfort Square - 3.4
Franklin Park - 0.9
Glencoe - 0.7
Glenview - 1.3
Glenwood - 2.4
Golf - 1.3
Hanover Park - 0.8
Harvey - 3.4
Harwood Heights - 1.3
Hazel Crest - 3.4
Hickory Hills - 1.9
Highland Park - 0.7
Hillside - 1.5
Hinsdale - 1.5
Hodgkins - 1.9
Hoffman Estates - 0.8
Homer Glen - 2.8
Hometown - 1.9
Homewood - 3.4
Indian Head Park - 1.5
Inverness - 0.9
Itasca - 0.9
Justice - 1.9
Kenilworth - 1.3
La Grange - 1.9
La Grange Park - 1.9
Lansing - 2.4
Lemont - 1.5
Lincolnwood - 1.3
Lockport - 2.8
Long Grove - 0.5
Lynwood - 2.4
Lyons - 1.9
Markham - 3.4
Matteson - 3.4
Maywood - 1.3
Melrose Park - 1.3
Merrionette Park - 1.9
Midlothian - 1.9
Morton Grove - 1.3
Mount Prospect - 0.9
Niles - 1.3
Norridge - 1.3
Northbrook - 0.7
Northfield - 1.3
Northlake - 0.9
North Riverside - 1.9
Oak Brook - 1.5
Oak Forest - 3.4
Oak Lawn - 1.9
Oak Park - 1.3
Olympia Fields - 3.4
Orland Hills - 3.4
Orland Park - 3.4
Palatine - 0.9
Palos Heights - 1.9
Palos Hills - 1.9
Palos Park - 1.5
Park Forest - 3.4
Park Ridge - 1.3
Phoenix - 3.4
Plum Valley - 2.4
Posen - 1.9
Prospect Heights - 0.9
Richton Park - 3.4
Riverdale - 1.9
River Forest - 1.3
River Grove - 1.3
Riverside - 1.9
Riverwoods - 0.5
Robbins - 1.9
Rolling Meadows - 0.9
Romeoville - 1.5
Roselle - 0.9
Rosemont - 1.3
Sauk Village - 2.4
Schaumburg - 0.9
Schiller Park - 1.3
Skokie - 1.3
South Barrington - 0.8
South Chicago Heights - 3.4
South Holland - 2.4
Steger - 2.4
Stickney - 1.9
Stone Park - 0.9
Streamwood - 0.8
Summit - 1.9
Thornton - 2.4
Tinley Park - 3.4
University Park - 3.4
Westchester - 1.5
Western Springs - 1.5
Wheeling - 0.5
Willow Springs - 1.5
Wilmette - 1.3
Winnetka - 1.3
Wood Dale - 0.9
Woodridge - 1.5
Worth - 1.9
Dyer - 2.4
Hammond - 2.4
Munster - 2.4