Hot Spots: Top 25 Towns on Saturday's Heat Index

Parts of the Chicago area hit 116 degrees on the “peak heat index” Saturday afternoon, according to unofficial readings from the National Weather Service in Chicago. Storms hit some suburbs briefly but pretty hard on Saturday, too. Sunday’s high is expected to be 87 degrees, with a 30 percent chance of showers.

The heat index expresses the discomfort felt as a result of the combined effects of the temperature and humidity of the air.

Here are the top 25 heat index readings from Saturday.

1. Sycamore: 116 degrees, 1:56 p.m.
2. Shorewood: 115 degrees, 12:54 p.m.
3. Naperville: 115 degrees, 3:35 p.m.
4. Palos Park: 115 degrees, 2:41 p.m.
5. Minooka: 115 degrees, 1:05 p.m.
6. Plainfield: 114 degrees, 12:55 p.m.
7. Oak Lawn: 113 degrees, 3:16 p.m.
8. Lake in the Hills: 113 degrees, 2:12 p.m.
9. Tinley Park: 113 degrees, 2:50 p.m.
10. Joliet: 111 degrees, 1:55 p.m.
11. Montgomery: 110 degrees, 1 p.m.
12. Algonquin: 109 degrees, 2:09 p.m.
13. Palatine: 109 degrees, 2:28 p.m.
14. Bolingbrook: 109 degrees, 1:25 p.m.
15. Palos Heights: 109 degrees, 2:55 p.m.
16. Romeoville: 108 degrees, 2:30 p.m.
17. Oswego: 108 degrees, 2:41 p.m.
18. Woodridge: 108 degrees, 2:25 p.m.
19. Geneva: 108 degrees, 3:22 p.m.
20. Orland Park: 108 degrees, 1:24 p.m.
21. Flossmoor: 108 degrees, 3:20 p.m.
22. Homewood: 108 degrees, 3:50 p.m.
23. Lemont: 108 degrees, 2:45 p.m.
24. Batavia: 107 degrees, 3:17 p.m.
25. Frankfort: 107 degrees, 3:17 p.m.